One I haven’t seen mentioned here is familiarize yourself with tenancy laws in the place you want to move to. It is always good to know your rights, and with landlords these days, you have to be as savvy as you can. A lot will come from experience, but knowing what they’re allowed to do or not do is priceless.
Conversation logs (for the games where they make sense). I loved having this available in Dragon Age: Origins and it helped me remember my rationale for doing specific things. Also was just fun to read back through.