रेफ़रेंस लाइब्रेरी
पढ़ाई और रिसर्च के लिए भरोसेमंद, मुफ़्त संदर्भों की एक छोटी, चुनी हुई सूची। सभी लिंक नए टैब में खुलते हैं।
एनसाइक्लोपीडिया और सामान्य संदर्भ
- Wikipedia The fastest way to get oriented on almost any topic. Follow its footnotes to real sources.
- Encyclopaedia Britannica Editor-reviewed articles you can safely cite when Wikipedia is not accepted.
- Stanford Encyclopedia of Philosophy Peer-reviewed, in-depth entries, the standard reference for philosophy essays.
- Wikimedia Commons Millions of freely licensed images and diagrams for presentations and projects.
- Our World in Data Clear charts and datasets on global topics, ready to cite in essays.
- CIA World Factbook Up-to-date country statistics (population, economy, geography) in one place.
मुफ़्त पाठ्यपुस्तकें और कोर्स
- OpenStax Complete peer-reviewed textbooks you can download instead of buying.
- MIT OpenCourseWare Full MIT courses with lecture notes, problem sets, and exams to practise on.
- Khan Academy Short video lessons with instant practice, good for filling gaps before an exam.
- LibreTexts Huge open library of chemistry, biology, and maths texts organised by course.
- Open Yale Courses Recorded Yale lectures in full, strong for humanities and psychology.
- Coursera (audit) Most university courses can be audited free: skip the certificate, keep the content.
- OpenLearn Free Open University short courses with built-in self-assessment.
विज्ञान और गणित
- Wolfram Alpha Solves equations step-free and answers computable questions. Great for checking work.
- Desmos Instant in-browser graphing calculator: see what a function actually does.
- GeoGebra Interactive geometry and algebra you can drag around to build intuition.
- PhET Simulations Physics and chemistry experiments you can run in the browser when there is no lab.
- Wolfram MathWorld Precise definitions and theorems when your textbook is vague.
- NASA Real mission data, images, and explainers for space and earth science projects.
- PubMed Search real biomedical research. Abstracts are free and citable.
- Periodic Table (Ptable) Interactive periodic table with properties, isotopes, and orbitals on hover.
- 3Blue1Brown Visual explanations of calculus and linear algebra that make the ideas click.
लेखन और साइटेशन
- Purdue OWL The standard guide for APA/MLA citation rules and academic writing structure.
- Merriam-Webster Reliable dictionary with usage notes. Settles "which word is right" arguments.
- Cambridge Dictionary Definitions in plain English plus translations, kinder to non-native speakers.
- Thesaurus.com Fast synonyms when the same word keeps appearing in your essay.
- Hemingway Editor Paste a draft and it highlights sentences that are too long or too dense.
- Zotero Collects sources as you browse and formats the bibliography for you.
- Etymonline Word origins, useful for language essays and remembering vocabulary.
इतिहास और मानविकी
- Project Gutenberg Over 70,000 public-domain classics: every set text older than 1929, free.
- Internet Archive Borrow scanned books and revisit dead web pages via the Wayback Machine.
- JSTOR (free reading) Register free to read a quota of real academic papers each month.
- World History Encyclopedia Well-sourced ancient and world history articles written for students.
- The British Museum Search millions of objects from the collection with images and context.
- Smithsonian Open Access Millions of museum images and 3D models, free to reuse in any project.
- Google Arts & Culture Zoom into artworks in extreme detail and tour museums virtually.
- Library of Congress Primary sources (photographs, maps, newspapers) for history projects.
भाषाएँ
- Wiktionary A free dictionary in many languages, with full conjugation and declension tables.
- WordReference Bilingual dictionaries with forum threads on the phrases textbooks miss.
- Forvo Hear any word pronounced by native speakers before you say it in class.
- Tatoeba Millions of example sentences with translations, so you can see words used in context.
- DeepL Best-in-class machine translation for checking your own sentences.
पढ़ाई के कौशल
- Learning Scientists Six study techniques that actually work, explained with printable guides.
- Anki Free spaced-repetition flashcards, the heavyweight option for long-term memory.
- Pomofocus A clean Pomodoro timer if you want one outside Brainlag.
- Crash Course Fast, funny video overviews of whole subjects, good before starting a topic.
कोई संसाधन मेल नहीं खाता। कोई और शब्द आज़माएँ।