I first started editing Wikipedia around 2005.
At that time I had grand plans of helping to perfect Wikipedia article-by-article in roughly alphabetical order. In my own defense, Wikipedia was still kinda small at the time so it seemed to be an achievable goal.
Lately, I have been a U.S. tax practitioner and a Contract Bridge instructor. I haven't made many edits over the last 15 years, but I try to restrict myself to these two topics where I have actual expertise.