My method for android & desktop. I never sign in to YouTube & never use the app. Using Joplin synced through Nextcloud (any syncable note taking app would do the trick) I keep a list of channels ("subscriptions") & interesting looking videos ("watch later") which I group by length. Obviously, this way the links can be via Piped, YouTube whatever.
I only ever interract through browser which is never signed in. Kiwi browser on Android, Firefox or Brave on desktop. All of them run uBlock + SponsorBlock + DeArrow.
DeArrow is by the same dev/s as SponsorBlock & gives anti clickbait crowd sourced titles & thumbs. Its become an invaluable tool so I'm glad to have paid to offer some support.
All of the browsers have history/cookies etc cleared once closed.