I've been using the "uBlock Origin" browser extension on my Windows PC for years, so I don't see any ads. It even blocks video ads on YouTube. I can't recommend it enough.
https://ublockorigin.comAlso, the "Unhook" browser extension makes YouTube even a bit more bearable, by being able to disable many things like recommended videos, comments, profile photos, live chats, fundraisers, merchandise, ticket sales, the video wall at the end of videos, video overlays, annotations, and more.
https://unhook.appBoth are free.
However, as far as I can tell, they are only for Windows platforms. So, if you ever reach your fill with ads on your phone, you could try installing these extensions on your Windows computer. Obviously, that's not as convenient, though.