Hey, welcome! Blorp is under active development so might not yet be feature complete. The other UIs (“frontends”) are all quite established now. You can use photon (m.lemmy.zip) on desktop or mobile, and its fully feature complete.

I usually stick to Hot/All, generally a good turnover of posts for me :)

Hot is the most upvoted posts recently, active is the most comments. I believe scaled promotes smaller communities, but I don’t use it much personally.