I have a small-ish one I use just to keep track of everything. Whats on tap, whats in bottles, whats in primary, what’s in secondary for an overview of where I’m at.
I still label everything. I just stick painter’s tape on my carboy and write what it is, date brewed, og, and yeast. Then I just transfer the tape to another carboy if I use a settling carboy. Finally I can transfer the same piece of tape to the inside lid of the case when/if I bottle.
For bottle labels I am loving these FastLabels, but they seem to be getting hard to find now. Basically a plastic shrink that goes over the bottom 3/4 of the bottle. I print my labels with Photoshop and cut them out. Then you stick the label inside the plastic shrink and do a quick dunk in boiling water. No glue or anything, and the plastic is waterproof. When you’re done you just peel the plastic off and the label falls right off.
For my kegerator, I have a couple blank tap handles I bought. Again I just print the labels with photoshop, cut them out and stick them on with double sided tape. I used to cover the label with clear contact paper first, but I haven’t even been doing that lately.