[gregoriol]

I'd add: also confirm promptly that you understood the answer and are good.

Sometimes after posting an explanation that has taken you time to think and write, you want to know if the other person understood it and if this is enough, and also if you can go back to your other stuff. Without an acknowledgement, you would likely keep the subject in your head in case the person needs more from you. With a simple "ok", "thanks", or a thumbs up, you can clear your head and go back to other things.

[worldsayshi]

I might sometimes fail on this I think and it's mostly because I have to think a lot or test the solution before I know if I understand it and that it provides enough context.

I often do this and forget to upvote correct SO answers as well. I find a solution, realize that I have to research a bunch of other things, and spawn twenty more tabs and the SO answer gets lost in the pile. What's the point of upvoting SO answers if you haven't been able to confirm that the solution is correct?

I guess I sometimes might do this with chat responses as well. But yeah in that situation something like "Thanks I will try it out!" is probably the appropriate response.