The changes I make are usually to fix spelling errors, undo vandalism and to welcome people to Wikipedia. I typically use Twinkle and sometimes Huggle to undo vandalism.
My userpage on Meta-Wiki has more information, like a full list of my accounts.
In the past I used the account Кощки123 (talk · contribs) to change Wikipedia. I only changed the English Wikipedia, Russian Wikipedia, Wikidata and Wikimedia Commons using that account, not this Wikipedia, the Simple English Wikipedia.