There’s a few options
Newpipe, uses it’s own extractor, also can act as a player for SoundCloud and Peertube, there’s also a fork with SponsorBlock: https://newpipe.net/
Libretube, uses the Piped api, generally seen as the one with the best UI: https://github.com/libre-tube/LibreTube
Clipious, uses the Invidious api: https://github.com/lamarios/clipious
Could also watch videos in a browser from an Invidious or Piped instance I guess
And while I’m at it I’ll also mention there’s a client option on desktop too, Freetube: https://freetubeapp.io/
This is probably the best resource for keeping track of which search engine options exist and what their quality is like: https://seirdy.one/posts/2021/03/10/search-engines-with-own-indexes
For a “fire and forget” option that doesnt require any configuration you cant go wrong with good ol DuckDuckGo: https://duckduckgo.com
If you’re okay with dealing with more configuration and breakage then Searx can be pretty powerful as its a metasearch engine that can search with every search engine you tell it at once and agregate the results(while proxying things to maintain privacy): https://searx.space (had decent luck with the https://search.sapti.me instance if you just wanna try it out without searching through a list of options)
Also all search engines are kinda bad due to SEO spam and “AI” generated images and articles polluting the results, consider using uBlacklist to help you filter out the trash from search results(think of it like ublock origin for search engine results), can use it for basically any search engine so no reason to not set it up: https://github.com/iorate/ublacklist