If someone provides a good edit to my post, what is the proper way to provide feedback or thank that person? Is it necessary? I do not yet have enough rep to edit other posts, and expect that I will be reluctant to do so other than typos and minor edits, so I expect some positive feedback on an edit would surely be welcome.
Speaking as someone who edits a lot, I don't need thanks, and I don't want to clutter up the comments with such thanks. Frankly, as long as you aren't rolling back my edits because you insist your mangled version was better, you've already thanked me.
Send him a thank-you basket filled with bratwurst, sauerkraut, and beer. Editors love those.
Just leave a comment thanking the editor for cleaning up the question, it's the only way really.
You should go edit and improve one of their questions or answers.
A thing you could do, related to this question is find a post of their's at 9 upvotes or something like that, and so long as you think it is a good answer, you could upvote them there. I wouldn't encourage upvoting a bad answer, but I completely understand the desire to show your appreciation.