There's a massive bank of free online courses from some of the biggest educational institutions in the world sitting on edX. You can find free lessons on useful topics like AI, Python programming ...

CS 103: Introduction to Computer Science in Python (waived for applicants with two years of working experience in the computing/IT field). Any Introduction to Programming course that uses a 3rd ...

And these free courses come from some of the biggest and best educational institutions in the world, including MIT. You can find lessons on AI , modern finance, Python programming , and much more ...