here's a free tip for all the #TwitterMigration people:

mastodon ONLY has text search for your toots, and the toots of people you follow, nothing beyond that, so you MUST use hashtags for others to be able to find things you post. And don't be afraid to use them, unlike the hellsite, mastodon doesn't limit your reach in any way based on how many hashtags or links you use in your posts :)

and there's an edit button too 

and make sure to follow @feditips for more awesome Mastodon Tips™