You can use:

Revanced

• https://github.com/ReVanced/revanced-manager
• https://revanced.app/

This patches the official YouTube app with a lot of different options including removing those ads.

NewPipe

• https://github.com/TeamNewPipe/NewPipe
• https://newpipe.net/
• https://f-droid.org/packages/org.schabi.newpipe/

This scrapes the website, and is my preferred YouTube app. You cannot log into an account though, which isn't an issue for me. You can also import/export your subscriptions. They are still working on getting comment replies into the app though.

LibreTube

• https://github.com/libre-tube/LibreTube
• https://f-droid.org/en/packages/com.github.libretube/

This uses Piped API, and you can choose with instances you want to use. This has comment replies in the app.