3blue1brown contains in-depth discussions of varied topics in mathematics and computer science accompanied by stunning animations.
Some of the notable series that I have already watched are Essence of Linear Algebra and Essence of Calculus. What is interesting is that the programming language used to build the animation in this channel was created by Grant Sanderson, the channel’s creator himself.
Professor Leonard is ideal for High School and College students who want to self-study mathematics. The channel has full length lectures of actual classes in Algebra, Precalculus, Statistics, and Calculus 1-3. He has recently finished publishing full video lectures on Differential Equations.
Numberphile started as a channel discusses facts about numbers. It has since expanded discussing topics in a wide variety of fields of mathematics. This channel has successfully explained many difficult topics in layman’s.
4. Khan Academy
Khan Academy contains thousands of videos from Grade School to University Mathematics. The channel includes tutorials on Basic Math, Algebra, Trigonometry, Precalculus, Calculus 1-3, Linear Algebra, and Differential Equations. Aside from mathematics, it also covers other areas such as Biology, Chemistry, Physics, Arts and Humanities, and Reading and Language Arts. It also contains practice exercises.
MyWhyU has animated tutorials with in-depth discussions about algebraic rules. What is unique about it is that it combines discussion of procedures with an in-depth discussion about the concept behind the procedures and its extensions.
6. Patrick JMT
Patrick JMT contains short to-the-point video tutorials for specific topics. This channel is ideal if you are reviewing for examinations.
7. Bill Kinney
Just like Prof Leonard, Professor Kinney is a channel that contains many actual class lectures. This channel discusses a wide variety of University Mathematics. This includes Calculus 1 and 2, Multivariable Calculus, Linear Algebra, Abstract Algebra, Differential Equations, and many more. There are also some tutorials on Mathematica.
MIT Courseware contains hundreds of undergraduate and graduate courses in mathematics, the sciences, and other fields. Many of the courses contain syllabi, complete video lectures, notes, reading lists, and assignments with solutions.