Maximilian Schwarzmüller’s JS courses are said to be good, I only tried his Vue course, that one is indeed good.
Mosh Hamedani had great C# courses, but sadly he hasn’t been updating them, so by now they’re outdated. Could be still relevant for the basics.
Asim Hussain’s JS courses
Aaron Parecki’s The Nuts and Bolts of OAuth - I’ve found it a straight to the point explanation of the basics that should be enough for smaller projects, and also enough for you to make your further research when you need it.
Not programming, but I would put Kody Amour’s math courses here as well.
Nathan Stocks’ Rust courses are fine. I got them for free, if you watch out, you might find him posting coupon codes for free access to his courses. I haven’t found them especially excellent, but for free they’re actually pretty good.
Udemy.
The catch is, unfortunately 95% of the courses there are trash, and it can be a real challenge to find those 5% that are actually valuable.
Edit: on Udemy, there are almost always discounts. If you don’t see prices around €12-20, just wait a week or two.
Can you list ones you found valuable?