Academic Resources
Video lectures on various topics:
Differential Topology | Lecture 1 by John W. Milnor
Nonlinear Dynamics and Chaos - Dr. Shane Ross
Collective Dynamics in Complex Systems
A short course on modular forms by Prof. M. Ram Murty
General Topology (Point Set Topology)
Homepages of different academic courses:
Awesome Cources
18.783 Elliptic Curves
Probability
Introduction to Category Theory
18.102 Introduction to Functional Analysis
Applied Category Theory Course - John Baez
18.S097 Applied Category Theory
16.410 Principles of Autonomy and Decision Making
18.03SC Differential Equations
Classic textbooks that are free online:
Structure and Interpretation of Computer Programs - Abelson and Sussman
Other topics:
Graduate Students' Guide to Generals