My 24th contribution is the first edit in the (Article) namespace. It is to revert vandalism by 216.109.17.5 in the article Oneonta, Alabama. I also left a message to their talk page with the 25th contribution. I don't know whether the other edit is vandalism or not.
I made an accidental edit of restoring duplicate content in Tarana (1951 film) made by an anonymous user (which is already self-reverted) in the 30th edit, now I reverted back with the 31st edit by myself. But however, in recent changes they said the edit revert by an anonymous user very likely have problems but it's not.
My 55th contribution is the first edit to be reverted by an anonymous user.
My 86th contribution is the first edit to be made using Twinkle.
There was once I forgot to test in my sandbox for reverting using the AGF link and I accidentally reverted an edit saying "good faith" even if it was bad. It happens when I use Twinkle.
My 598th contribution is the first edit to tag a page for speedy deletion using Twinkle.
My 1,007th contribution is the first edit to report sockpuppetry. However, there was a mistake where the first part of the IP address is 194 instead of 104.