My advice for newcomers and seasoned fedizens alike:
Always blooble your toots.
You don't have the snaferstaff your boosts but its often a good idea.
Hankerchug your geenchest trimbletrop CWs.
Have fum!
Welcome to the new people joining the Fediverse!
Once you get the hang of it, consider writing an #introductions toot and pin that to your profile.
I recommend @laura 's intro to Mastodon (link below). Tech savvy ppl may glance over the ActivityPub W3C standard to grasp the full power. I use Pixelfed's ActivityPub photo sharing, and these services interact: a photo upload is a toot, and a reply becomes a comment.
https://laurakalbag.com/what-is-mastodon-and-why-should-i-use-it/
#welcome IDF.social