google for "sponsorblock" extension for your browser, crowdsourced data makes it skip all the promotions, intros, "like and subscribe" and all other unneeded parts.

And when you're at it, ublock origin also skips the youtube ads.

There's also: https://freetubeapp.io/ , but it's a constant cat and mouse game with youtube, where you now have to refresh a video a few times before it starts playing (then it works fine), until they upgrade the software and then it works, until youtube changes something again.