I'll just share what i know
"Sharing Things" is where you share your stuff, there's 3 of them. If you want to post smth about it then just click any tags there and there'll be an option ①"i want to do/i did", ②"question" and ③"experience" right?
The first one is basically a dump to share what you feel, no one can reply neither interact on what you post there.
The second one is question where people can interact with your post and even reply it with images/gif (though you can't do that in the post). Everytime someone interact with your post, they'll show up on the things(?) timeline to grab more attention to your post.
The third one is kind of like question but uhh.. Lite version or smth. People still can interact but can't reply with any media but you can include it in the post.

ive been here since 2021 but i still don't know few things how mangago works. how to use that experience/question/sharing things? ive been clicking around but still clueless