For the past few years there has been an explosion of online content w.r.t. courses on different topics. Some are good, some bad, some excellent.
What are some of the best online courses on Computer Science that you have taken and really enjoyed? What did you learn from them?
What are you doing now? Working or learning more?
Helerstein's CS186 video lectures (Introduction to Database Systems, 2015) are probably the most informative CS-thing I have experienced online:
https://archive.org/details/ucberkeley_webcast_dY48_UZhvhw
But of course, it is not an online course. Just course lectures online.
It's informative because the problems - IO, optimization, caching, concurrency, partition, etc. are all right there in ways that require engineering (i.e. theory alone won't get you to the required scale). YMMV.
Good luck.