Purnima Lallan Sharma Foundation · Est. 2021
PLS FoundationPLS FOUNDATIONEducate. Empower. Care.

THE PLS FREE LEARNING PORTAL

Knowledge to understand.
Confidence to contribute.

Free guides across science, mathematics, humanities, philosophy, Hindu traditions, digital skills, enterprise and welfare. Read in English or Hindi. Begin with a topic, or learn step by step.

Choose your field of learning

89 GUIDES · TWO LANGUAGES · FREE TO READ

Start with what you want to understand

Digital skills

Beginner

How computers and files work

A phone and a school computer both process instructions, keep information and exchange files.

Learning outcome: Explain memory versus storage, organise a small project, distinguish copying from moving, and test an offline copy and backup before relying on them.

Read the guide →

Digital skills

Beginner

Passwords, passkeys and account safety

Protecting an account involves more than choosing a complicated word.

Learning outcome: Explain password reuse, distinguish a passkey from a device PIN, recognise unexpected sign-in prompts and make a recovery plan without writing real secrets into an exercise.

Read the guide →

Digital skills

Beginner

Spotting phishing and online scams

Scams often persuade people to perform an ordinary action for a false reason: sign in, approve a payment or install an app.

Learning outcome: Recognise common persuasion tactics, explain two worked scams, distinguish receiving money from authorising a debit, and prepare a factual incident record.

Read the guide →

Digital skills

Intermediate

Spreadsheets: formulas, tables and trustworthy totals

A spreadsheet becomes useful when each number has a meaning and each formula can be checked.

Learning outcome: Create a small calculation table, explain relative and absolute references, interpret an average correctly and sort records without separating related fields.

Read the guide →

Digital skills

Beginner

Documents, email and professional communication

Clear communication helps another person understand your purpose and act correctly.

Learning outcome: Create a structured one-page note, improve an unclear request, choose recipients deliberately and verify a document link from the recipient’s perspective.

Read the guide →

Digital skills

Beginner

Understanding AI and checking its work

An AI answer can be fluent, useful and wrong at the same time.

Learning outcome: Explain tokens and context at a beginner level, verify two types of AI error, write an effective practice prompt and protect privacy while preserving your own learning.

Read the guide →

Digital skills

Beginner

Personal data and digital footprints

A digital footprint includes what you post, what a service records and what others can infer by combining details.

Learning outcome: Identify direct and inferred personal information, explain cookies and private browsing, redesign an over-collecting form and review a file or photo before sharing.

Read the guide →

Hindu texts & traditions

Intermediate

Karma yoga: responsible action offered without possessiveness

How can work become a spiritual discipline when its outcome remains uncertain? The Bhagavad Gita develops an answer through duty, offering, concern for others and the character of the person acting.

Learning outcome: Explain yajna and lokasangraha, distinguish nonattachment from carelessness, and apply the Gita's account of action and the agent to an ordinary responsibility.

Read the guide →

Hindu texts & traditions

Intermediate

Knowledge and devotion in the Bhagavad Gita

The Bhagavad Gita joins inquiry about the self with a loving relationship to Krishna.

Learning outcome: Explain three connections between knowledge and devotion, interpret a sequence from chapter 12, and design a practice that joins worship with ethical attention.

Read the guide →

Hindu texts & traditions

Intermediate

The Upanishads: self, reality and the search for understanding

The Upanishads ask what makes a life meaningful and what remains fundamental beneath changing experience.

Learning outcome: Explain three Upanishadic teachings without confusing their comparisons with literal descriptions, and distinguish self-inquiry from merely improving one's public image.

Read the guide →

Hindu texts & traditions

Intermediate

Duty and leadership in the Valmiki Ramayana

The Ramayana teaches through decisions that affect families, kingdoms, allies and people seeking protection.

Learning outcome: Analyse three leadership decisions in named Ramayana passages and apply their reasoning to an ordinary responsibility without treating an epic kingdom as a modern institution.

Read the guide →

Hindu texts & traditions

Intermediate

Dharma and difficult choices in the Mahabharata

The Mahabharata examines duty through loyalty, ambition, injustice, compassion and the cost of victory.

Learning outcome: Reconstruct the reasoning of three epic decisions, distinguish explanation from excuse, and use a clear process for examining an everyday ethical dilemma.

Read the guide →

Hindu texts & traditions

Intermediate

The eight limbs of yoga as an integrated discipline

Patanjali's Yoga Sutra connects conduct, bodily steadiness, attention and insight.

Learning outcome: Explain the role of each limb, apply two specific Yoga Sutra teachings to ordinary conduct and distinguish a beginner's exercise from the text's advanced spiritual attainments.

Read the guide →

Hindu texts & traditions

Beginner

Hindu festivals: sacred time, seasons and shared life

A festival can join worship, remembered sacred events, seasonal work, food, art and hospitality.

Learning outcome: Explain the sequence and meaning of three observances, identify regional examples accurately and plan a thoughtful contribution to a family or community celebration.

Read the guide →

Hindu texts & traditions

Beginner

Temples, puja and sacred space

A temple brings together a sacred image, a carefully organised place and a continuing pattern of worship.

Learning outcome: Recognise the main spaces of a temple, distinguish darshan, arati, naivedya and prasad, and explain a worship sequence through scripture and the example of Tirumala.

Read the guide →

Philosophy & reasoning

Beginner

Asking philosophical questions

When friends disagree about success, fairness or a good life, they may be using the same word for different ideas.

Learning outcome: Turn a broad disagreement into a precise question, distinguish different kinds of inquiry, and improve an answer through a counterexample.

Read the guide →

Philosophy & reasoning

Beginner

Logic, arguments and fallacies

An argument is more than a disagreement.

Learning outcome: Map an argument, test a conditional claim, distinguish deduction from induction, and repair common errors without attacking the speaker.

Read the guide →

Philosophy & reasoning

Intermediate

Ethics: duty, consequences and character

Ethical decisions ask what we ought to do and why.

Learning outcome: Apply three ethical lenses to a concrete choice, recognise their limits, and justify an action without reducing people to numbers or intentions.

Read the guide →

Philosophy & reasoning

Intermediate

Knowledge, belief and evidence

You can believe a bus leaves at nine, correctly guess that it leaves at nine, or know its departure time from a reliable current timetable.

Learning outcome: Distinguish truth, belief and justification; compare perception, inference and testimony; and explain why appropriate confidence may change with new evidence.

Read the guide →

History, literature & society

Beginner

Understanding history and its sources

History explains change in human lives through evidence from the past.

Learning outcome: Read material and written evidence, distinguish an official intention from actual practice, and construct a qualified explanation of change.

Read the guide →

History, literature & society

Beginner

Reading literature and interpretation

Literature creates experience through language, form and perspective.

Learning outcome: Distinguish author, narrator and character; explain the effects of imagery and structure; and compare interpretations using textual evidence.

Read the guide →

History, literature & society

Beginner

Society, culture and institutions

People make choices within relationships, expectations and unequal opportunities.

Learning outcome: Explain how a rule, a social expectation and access to resources interact, and distinguish individual choice from the conditions shaping it.

Read the guide →

History, literature & society

Intermediate

Democracy, rights and public reason

Shared decisions require more than counting preferences.

Learning outcome: Distinguish majority choice from constitutional authority, explain why rights and remedies matter, and evaluate a shared proposal using public reasons.

Read the guide →

Mathematics

Beginner

Geometry: measure boundaries, surfaces and space

Fencing a garden, covering a floor and filling a container ask three different measurement questions.

Learning outcome: Calculate rectangular, triangular and circular measures, split a compound shape into simpler pieces, and distinguish container capacity from the material needed to build it.

Read the guide →

Physics

Intermediate

Work, energy and power: follow transfers and rates

Lifting the same box slowly or quickly changes the required average power, while the ideal energy transfer can stay the same.

Learning outcome: Calculate signed work, kinetic and gravitational potential energy, distinguish energy from power, and test whether a mechanical-energy shortcut is justified.

Read the guide →

Physics

Beginner

Heat, temperature and energy transfer

A steel tumbler and a cloth bag in the same room can feel different even when their temperatures are equal.

Learning outcome: Explain conduction, convection and radiation, calculate simple heating and mixing cases, and state which energy transfers a model ignores.

Read the guide →

Physics

Beginner

Waves, sound and hearing

When a school announcement reaches the back of a room, air from the loudspeaker has not travelled all the way into every listener’s ear.

Learning outcome: Distinguish particle motion from wave motion, calculate wavelength and echo distance, and explain the main stages of hearing using a labelled paper model.

Read the guide →

Physics

Beginner

Light, reflection and refraction

A printed page, a mirror image and a pencil seen through water all become visible because light reaches the eye.

Learning outcome: Construct plane-mirror ray diagrams, distinguish real and virtual images, predict basic refraction directions and calculate refractive index from speed.

Read the guide →

Physics

Intermediate

Electricity: current, voltage and resistance

A torch needs a complete conducting path, a source of energy and components that transfer that energy.

Learning outcome: Explain circuit quantities, analyse ideal series and parallel resistor networks, and check charge and energy accounts entirely with paper diagrams.

Read the guide →

Chemistry

Beginner

Matter, particles and changing states

A puddle shrinks, a cold bottle becomes wet, and a balloon keeps its shape.

Learning outcome: Explain solids, liquids, gases, diffusion and changes of state, then use a mass balance and a temperature record to test a particle explanation.

Read the guide →

Chemistry

Intermediate

Chemical reactions: new substances, conserved atoms

Rusting and melting both change what we see, but only one forms new substances.

Learning outcome: Interpret reaction evidence, balance simple equations without changing formulas, and explain apparent mass gains or losses by tracing matter across a boundary.

Read the guide →

Science & evidence

Beginner

Scientific thinking: experiments, measurements and evidence

Why does a fair test matter? Learn how variables, repeated measurements and alternative explanations turn a sensible guess into a conclusion you can defend.

Learning outcome: You will turn a broad curiosity into a testable question, plan a fair comparison, and distinguish a result from the explanation offered for it.

Read the guide →

Hindu texts & traditions

Beginner

Hinduism basics: dharma, karma, moksha and daily life

What makes an action right? What continues when the body changes? What is a life well lived? Hindu traditions connect these questions with worship, family responsibilities, learning and service.

Learning outcome: Explain six foundational terms, distinguish the four aims of life, recognise major forms of devotion, and apply dharma and responsible action to an everyday decision.

Read the guide →

Hindu texts & traditions

Beginner

Vedas, Upanishads, Ramayana and Gita: what they teach

Hindu sacred literature teaches through hymns, dialogue, disciplined inquiry and the lives of revered figures.

Learning outcome: Identify the main scriptural families and explain Uddalaka’s salt analogy, Nachiketa’s choice, Bharata’s trusteeship and three practical teachings from the Gita.

Read the guide →