Free access to premium content usually comes with a catch—often at the expense of your privacy or device security.
| Subject | Channel (link) | Typical video length | Why it’s useful | |---------|----------------|----------------------|-----------------| | | 3Blue1Brown – https://youtu.be/8hly3LJjY44 | 8‑20 min (visual, intuitive) | Beautiful animations that make calculus, linear algebra, and probability click. | | | PatrickJMT – https://www.youtube.com/user/patrickJMT | 5‑15 min (step‑by‑step) | Straight‑forward problem solving, perfect for homework review. | | Physics | MinutePhysics – https://www.youtube.com/user/minutephysics | 2‑5 min (conceptual) | Quick, sketch‑style explanations of core ideas. | | | Physics Girl – https://www.youtube.com/user/physicsgirl | 5‑15 min (experiments & demos) | Engaging demos that reinforce textbook theory. | | Chemistry | Tyler DeWitt – https://www.youtube.com/user/tdewitt451 | 7‑12 min (clear walkthroughs) | Great for organic & general chemistry fundamentals. | | Biology | CrashCourse Biology – https://youtu.be/8d6E9cP9bG8 | 10‑12 min (fast‑paced) | Covers cell biology, genetics, ecology, evolution in a lively style. | | History & Social Sciences | CrashCourse World History – https://youtu.be/1YcX0U5sG2E | 10‑12 min | Narrative‑driven, connects events across centuries. | | English / Literature | Thug Notes – https://www.youtube.com/user/ThugNotes | 8‑12 min | Fun, modern‑tone analyses of classic works (good for essay ideas). | | Computer Science | CS50 (Harvard) – https://www.youtube.com/playlist?list=PLhQjrBD2T382eX9qvY-7c5dP6C7p5r6bK | 45‑60 min (lecture) | Intro to programming, algorithms, web dev – very thorough. | | Economics | Jacob Clifford – https://www.youtube.com/user/JacobClifford | 8‑15 min | AP‑level econ concepts explained with clear examples. | vdio bokp sma free
Research has shown that exposure to explicit content, particularly at a young age, can have negative effects on individuals. These may include: Free access to premium content usually comes with
| Collection | Subjects Covered | How it’s organized | |------------|------------------|--------------------| | (search “OpenStax * subject* + lecture”) | Physics, Biology, Chemistry, Algebra, Statistics, etc. | OpenStax provides a free PDF textbook; many educators have recorded chapter‑by‑chapter videos that follow the exact page numbers. | | Khan Academy “Course Playlists” | Entire high‑school curricula (e.g., “AP Physics 1”, “Algebra 2”) | Click the “Course” dropdown → “Play all” to treat the series like a video book. | | MIT 8.01 (Classical Mechanics) – Full Lecture Series | Physics (calc‑based) | 24+ lectures, each 50‑70 min, matching MIT textbook chapters. | | University of Colorado Boulder – “Chemistry 101” (OCW) | General Chemistry | 20‑minute videos synced to a free textbook PDF. | | Stanford Online “Machine Learning” (Andrew Ng) – YouTube | Intro to ML (good for advanced high‑schoolers) | 10‑minute video segments that act like a textbook chapter. | | | Physics | MinutePhysics – https://www
