@hadeantaiga I definitely recommend digging around through the settings because there's alot going on and a lot of decisions made by default that may or may not be what you want.

You can find the social network connectors under Social Networks, I've enabled all that are included in Friendica. If it's an "Export" that means it'll copy your posts to your account on that platform, and Import being it bringing things in to Friendica (Tumblr is both and the Export is controlled by a checkbox, it also lets you specify up to 10 tags to import as well).

Friendica is also cross compatible with OStatus and Diaspora* with no configuration needed (though there's far far fewer users of those protocols, ActivityPub is the big name).

On top of all that, you can also follow RSS feeds.

And when looking at the settings, don't skip over Addons. It's not for you to enable addons but rather miscellaneous settings for addons I have installed (for instance the content filter addon defaults to blocking everything tagged nsfw).

I'm also fond of going to Display Settings, Content/Layout to set "Stay local" which cuts down on the times links send you to another site. There's also your account type, which sets certain behaviors (the default Standard requires you to accept all follow requests, I like Soapbox which lets anyone follow but I have to manually add them to Friends)