[diehunde]

I think O'reilly has one of the biggest catalogs for that budget: https://learning.oreilly.com/signup/

You have access to hundreds of good quality books, learning courses, conferences, etc.

Now, I've seen that for the best courses fos something in particular, you'll find material from different sites, and buy them individually can get much more expensive. I've seen good courses for specific topics from Linkedin learning, others very good from educative.io and even others from packtpub so it's a big decision just to go with one.

[mtnGoat]

I utilize this as well, have had a membership for almost a decade now. Great resource!

[slipwalker]

i strongly second this.