Ambient has become my absolute favorite genre of music, and on YouTube I really like seeing people create and play it. Like general synthesizer overview videos, I prefer those that have very little if any talking. One of the first pages I discovered, and keep coming back to, is RemixSample. One of the main “selling points” I think is that he doesn’t use any extravagant expensive gear. In fact, some of his music is only done with software instruments, and yet it sounds just as good (if not better). He also has a good balance of effects (namely delay and reverb) to sounds. In ambient this is not just important but critical.
In addition to his YouTube channel, there is a Patreon page you can join. Along with music, he offers sample packs along with answering questions on music gear, production, etc.