@ilario23 Pretty much like very, very old-school Twitter. Like, pre-2010 Twitter.
If you watch the Local timeline you'll see people's public posts (like this one); if you see someone interesting, give them a follow. You can search for hashtags as well if you're looking for people posting about a particular topic (though that does depend on people using hashtags; I'm pretty terrible at it).
If you're using the Mastodon app, it's apparently missing a number of features - I use Tusky for Android, but there are a few around.
@ilario23 Debirdify will search the twitter accounts you follow to find posted Mastodon accounts.
pruvisto.org/debirdify/
Use twitodon.com to register your account in a database, which allows others twho visit it to find you.
Add your account name, as your account name on that bird site, to help people find you here.