Boost. I used Boost for Reddit, so this app for Lemmy feels very familiar.
I like how few taps it takes to switch accounts. I like how I can set my default feed and sort and it sticks where some other lemmy apps I tried frequently reset to a trending feed, gross.
I like the feature that allows me to apply a custom tag to users that only I can see. I use it to keep an eye on potential trolls. If I have a person tagged as “MAGA troll”, I know not to engage with them but to grab the popcorn and enjoy the ride.