Can someone give me a brief explanation of various martial arts sports?

For context, I started jiujitsu in 2019, but am not very satisfied with the kind of training I'm receiving. I've been thinking about trying out brazilian jiujitsu, but honestly really don't know what all the martial arts are about. I really don't need something to make me some kind of movie assassin or marine but just something that's challenging and fun.

One last thing to note, I'm pretty small and as skinny as a bone, if that changes anything.