I like to bike when I can, but I’m still nervous to leave it even with a U-lock around the frame. I’ve also had a seat stolen before (not even a good one), but I’m not sure if there’s anything reasonable to do about that.
What do you do to lock up your bike for commuting?

I don’t exactly live in a high crime area and I ride cheapish bikes but I usually use my Foldylock Forever or Skunklock Chemical. The lock I use depends on the bike I’m riding too, but then I also supplement it with a Hiplok Gold if I’m extra worried.
Being smart about where you leave your bike helps a lot too.