For CS theory, I would rather suggest you to focus on classic CS courses, here's my list:
0. Do not touch "Introduction to Algorithms" until you are in a dream job.
1. CS 61A: The Structure and Interpretation of Computer Programs https://cs61a.org/
2. CS61B: Data Structures http://datastructur.es/sp16/
3. Coursera: Princeton Algorithm https://coursera.org/learn/algorithms-part1
4. CMU 15213 CSAPP https://courses.cs.washington.edu/courses/cse351/16sp/videos...
5. Keep moving.