Learning

Open-source knowledge graph and learning path platform. Search any topic to explore connected concepts and curated resources, ideal for self-learners mapping structure and tracking progress.

Instructables is a community platform where users share detailed step-by-step DIY projects and tutorials. Ideal for makers, hobbyists, and students looking for inspiration, learning how to build things, or publishing their own creations.

Seeing Theory is an educational website from Brown University offering interactive visualizations for learning probability and statistics. It helps users understand core concepts through engaging animations and diagrams.

Grant Sanderson’s site for visual math lessons. Animated explainers and interactive versions of topics like linear algebra, calculus, neural networks—ideal for students seeking intuitive understanding.

OceanofPDF is a website for discovering and downloading PDF and EPUB ebooks across multiple genres. Users should be aware that much of its catalog has been associated with copyright disputes and legal concerns.

Sci-Hub is a shadow library providing free access to millions of research papers by bypassing publisher paywalls. Sci-Hub.Pub serves as a directory listing current working Sci-Hub domains and alternatives.

WeRead (微信读书) is Tencent's digital reading platform offering a vast collection of licensed books, novels, comics, and audiobooks. It supports cross-device syncing, note-taking, and social sharing with WeChat friends, ideal for Chinese readers seeking convenient access to quality content.

wikiHow is a comprehensive how-to website offering thousands of step-by-step guides on topics ranging from everyday tasks and skills to health, relationships, hobbies, and more. It helps users solve practical problems with clear instructions, expert-reviewed content, and illustrations.

Monkey Pen offers a large collection of free downloadable PDF children's storybooks, coloring books, printable pages, and educational posters. It also provides personalized children's books where the child becomes the illustrated main character.

Musicca is a free online platform for learning music theory with interactive exercises, virtual instruments, and practical tools. It helps beginners and students improve note reading, rhythm, chords, and more through engaging practice.

A free interactive map from TeleGeography visualizing the world's major submarine cable systems and landing stations. Explore active and planned cables, routes, owners, and technical details.

Plottie is a free database featuring over 100,000 scientific plots and figures from open-access journals. It helps researchers, data scientists, and students discover high-quality visualization examples to inspire better charts and figures.

Class Central is an online course search engine and aggregator that collects hundreds of thousands of courses from providers like Coursera, Udemy, and more. It helps learners discover high-quality courses and read authentic user reviews.

iFixit offers tens of thousands of free step-by-step repair guides, replacement parts, and precision tools to help users fix phones, computers, appliances, and more themselves, extending device life and reducing e-waste.

PhET Interactive Simulations offers free interactive math and science simulations from the University of Colorado Boulder. Explore physics, chemistry, biology, and more through engaging, research-based virtual experiments.

iCourse163 (中国大学MOOC) is a Chinese MOOC platform offering free university-level courses from top Chinese institutions. Users can study at their own pace and obtain official certificates upon completion.

NetEase Open Course provides free access to video lectures from top global universities, TED talks, Chinese university courses, documentaries, and more. A popular platform for students, professionals, and lifelong learners seeking quality educational content.

TED offers thousands of short video talks by experts on topics spanning technology, science, business, culture, and global issues. A go-to resource for inspiration, learning, and broadening perspectives through powerful ideas.

Wiktionary is a free, collaborative multilingual dictionary by the Wikimedia Foundation. It offers millions of entries with definitions, etymologies, pronunciations, usage examples, and translations across many languages.

Authoritative English dictionary offering definitions, example sentences, pronunciations, grammar, thesaurus, and bilingual translations for learners and proficient users.

engVid offers thousands of free English video lessons covering grammar, vocabulary, pronunciation, business English, IELTS/TOEFL preparation, and more. Taught by experienced native teachers.