NOSTR newbie question. See photograph.

Also, how do you post your own notes, as opposed to as a comment, or repost, on/of somebody else's 'profile', 'identity'--i am struggling to find words to describe things on this other social, technological, paradigm (Nostr) very foreign to me.

Finally, how do you get those posts to go to a certain hashtag, like #nostr, #bitcoin, #permaculture, #coppicing,...?

Thank you.

Merci.

Gracias.

Dankeschön.

Grazie.