You want to watch #youtube, but get rid of the #advertisements? Is it too addictive for you? Don't you want to be in the tracking arms of google?
If one of these situations applies to you:
use #invidious to access all YouTube content! Without advertisements, distraction free, no need for javascript, simple and no tracking. And you can download the videos too!
A desktop application called "Freetube" uses invidious in the background. You can install "UntrackMe" on android, an app that automatically redirects links to non-invasive alternatives.
Another android application called "Newpipe" has the same features but still gets al the content from youtube itself, not trough invidious. It has alot of features including subscriptions and you will never need the official youtube application again if you don't need a youtube account!
Invidious is #open-source software for websites. More information here: invidious.io
FreeTube is an #open-source desktop application.
The #open-source android apps (newpipe, untrackme) can be found on F-Droid.org
All those software applications work best if you don't need an account. However, invidious is compatible with youtube accounts: those can be used there. Newpipe has no account compatibility. But it makes it up with really nice features.