question(s) about manga terms

so i've only joined(?) the manga community and i noticed that alot of readers use words that i don't know. here are the words idk:

fujoshi (is this what they call manga readers?)
seme (sorry bout this but when i read this i think of semen)
uke (ukelele?)
fudanshi (idk)

i feel like if i google it ill be traumatized haha lol