Does each onne of them conected or just a good single game? Like, ive watch three houses from youtube, but I dont see any connection.
some of them are in the same universe yeah, but there are different universes
Tellius: Path of Radiance (GameCube)(FE9) and Radiant Dawn (Wii)(FE10). they're the games with Ike
(from Smash Bros.!)
Elibe: The Blazing Blade (FE7) and The Binding Blade (FE6)(both GBA). the games with Lyn, Hector, and Roy.
Magvel: The Sacred Stones (GBA)(FE8). only one game taking place in this universe. this is the game with twincest.
Fodlan: Three Houses (Switch)(FE16) and the upcoming game Fortune's Weave (Switch 2)(FE17). i think Fortune's weave is going to be a prequel(?) that takes place on another continent in the same universe.
there are a few other universes, and i think the 3DS ones technically take place in the same universe as the original games (though at very different time periods), but you can really get into any game and learn the mechanics. i'd just avoid playing a direct sequel first (like Radiant Dawn).
Three Houses was actually my first Fire Emblem game and is still the main one i'd recommend. the plot/character dynamics are just kino, especially after
the timeskip