Blocking basically all ads on your phone is trivially easy.

1. Find "Private DNS" (or something similar) in your settings
2. Set it to dns.adguard-dns.com

And that's really it. There are other ad-blocking dns providers out there, and they all use slightly different block lists. I like adguard because their blocklist is less aggressive than others I've tried, and I'd rather an ad or two get through than for something legitimate to stop working.

You can also set it up as your dns provider in your router to block ads on your entire network. People tend to like to self-host adguard or pihole for that, but as long as you don't care about a dashboard or manual dns entries, using a free dns is as easy as it gets and is very effective. I self-host as a hobby and I still just use adguard's public dns.