Calligraphy hands are like potato chips, once you have one, you just want to keep going! LOL.
The styles are called “hands” - (fonts are for computers). And how many you want to learn are up to you. I think most calligraphers have 2-3 that they develop and practice on a regular basis and probably one they really excel at (or focus the most on).
I do Engrosser’s Script, Spencerian Script, Italic, Blackletter (or Gothic), Uncial, and then dabble in a few like Roman Caps, pointed pen Romans, swingline (a modern style developed by Kate McKulla), Weaver Writing (a modern hand developed by the late Gwen Weaver), and my own modern pointed pen styles (infinite variety). But Engrosser’s and possibly Spencerian are my strongest hands. I can probably emulate most but not all well.
Find whatever inspires you. You will never stop learning and you’ll find you will gravitate to many.