I basically edit small grammatical errors to citation verifications (checking for dead links, verifying information's authenticity, etc.) and sometimes, adding infos in some articles with a bit constructive manner to watching edit wars (lame, but true).
and basically if I get lazy, I just snoop to the Wiki-Humor Category (reading pointless AfDs and journals) then after that, I search Wikipedia for my academic activities (research, etc.).
if you are wondering what editor level am I, well I am a Level 1 Rookie editor and I use VisualEditor.
I also have a brief knowledge about Wiki markup.