Best Free Resources for Every Subject – Mega Thread
Hiii everyone!! So I’ve been compiling free resources for literally every subject and I wanted to share them all here because textbooks are SO expensive and not everyone can afford them, you know? Here’s my mega list:
**MATHEMATICS**
Khan Academy – seriously the BEST for understanding concepts from scratch. Every topic explained clearly with examples. 3blue1brown on YouTube for visualizing calculus and linear algebra in ways that actually make sense.
PatrickJMT for calculus specifically – his explanations are chef’s kiss
Paul’s Online Math Notes – comprehensive and organized beautifully
**PHYSICS**
Lectures by Walter Lewin (MIT OpenCourseWare) – absolutely incredible, this man makes physics exciting
Physics Ninja on YouTube – super clear explanations for mechanics and electricity
Hypophysics – interactive simulations that help you understand concepts
**CHEMISTRY**
Amoeba Sisters – fun, colorful chemistry explanations
Crash Course Chemistry – engaging and covers everything
Chemistry by Numbers – great for organic chemistry specifically
**BIOLOGY**
Crash Course Biology – truly comprehensive
Amoeba Sisters for basics
Khanacademy pathways for detailed learning
Bozeman Science for ecology and general biology
**LANGUAGES**
Duolingo – free version is solid (though premium is nice)
Language-specific YouTube channels are goldmines
Forvo for pronunciation
Clozemaster for contextual learning
**HISTORY**
Oversimplified – makes history entertaining and memorable
History Hit documentaries
PBS Learning Media – educational and reliable
**LITERATURE & WRITING**
Grammarly (free version helps catch errors)
Purdue OWL – absolute lifesaver for proper citation formats and writing help
Standardized Test Writing Resources on Khan Academy
Please add your own favorite resources in the comments! I’m always looking to expand this list for everyone in our community. Let’s help each other succeed without breaking the bank!! 💚📚
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OMG SARA YES!!! This is literally the most helpful thread ever?? I've been using like half of these already but I didn't know about the others so thank you so much!! For med school prep I'd also recommend:
- osmosis.it (literally game-changing for anatomy and pathology, the animations are insane)
- sketchy medical (for pharmacology, super visual and memorable)
- lecturio (free version has tons of content)
- pathoma (expensive but WORTH IT if ur serious about med school)
Also for those of us in medicine, First Aid for the USMLE Step 1 prep is basically essential but SO expensive so maybe check your school library?? We get access through our university and it's saved me literally thousands of dollars. Also YouTube channels like Dirty Medicine and Med School Insiders are lifesavers! Your list is so comprehensive omg 😭💕
yo sara mad respect for putting this together. for computer science stuff i'd add:
- geeksforgeeks (literally saved my life in data structures)
- visualgo.net for algorithm visualization (so fire)
- github has mad free coding tutorials
- udemy honestly has tons of free courses if u dig around
also shoutout to stack overflow even tho it can be kinda gatekeepy sometimes lol. ur list is fr one of the most useful threads on here ngl 🔥
Excellent compilation, Sara. A few additional resources worth noting:
For mathematics and physics, MIT OpenCourseWare offers complete courses with lecture notes, exams, and solutions. The quality is exceptional.
For engineering specifically, I would recommend:
- Professor Leonard's calculus lectures (extraordinarily thorough)
- Circuitlab for circuit simulations
- TinkerCAD for 3D design and electronics simulation
For programming (which many students overlook):
- Codecademy free tier
- FreeCodeCamp on YouTube
- LeetCode free problems
Your organization is impressive and I appreciate the effort to create this resource guide.
Oh my gosh thank you so much Matteo!! I totally forgot about MIT OpenCourseWare - that's literally incredible that they just put all their courses online for free?? And I'll definitely add those engineering resources because programming is something I've been wanting to learn too! FreeCodeCamp looks amazing, the YouTube videos look super thorough. You're so helpful!! 💚