@oraluchiaru under the bit where you type your toots there's a little globe icon, if you click that you'll get 4 options for post privacy
global goes to everyone, unlisted doesn't show in public timelines like local or federated but is viewable on your user page and to your followers, followers only is well followers only, private only goes to those you mention in that specific post (like a DM)
@troubleMoney oh i see ty!
@oraluchiaru no problem!
if you go to your settings page (by clicking the gear at the top of the left column) you can set any of those as default as well