Fuck can be used in many ways.
To fuck = vulgar word for sex
Ex: I would fuck him/her. = I would have sex with him/her.
Fuck can also show anger at something or someone.
Fuck you! = an expression of anger at someone
You can also say this with the middle finger hand sign.
Fuck! = surprise, pain, fear, disgust, disappointment, anger, or extreme joy. (No connection to sex.)
Go fuck yourself! = get away from me (literally: go masturbate)
Fuck that! = that is stupid
I don't give a fuck = I don't care
Fuck it! = I quit
What the fuck! = I don't understand
Fuck no! = No!
Fuck off! = leave me alone
Shut the fuck up! = be quiet
Motherfucker = someone you don't like
Literal meaning: saying someone had sex with their own mother. Extreme insult.
Sometimes motherfucker describes someone dangerous.
Ex: Bruce Lee was a bad motherfucker. = Bruce Lee was dangerous.
Fucking _____ = extremely _____
Ex: This food tastes fucking disgusting.
Important note: fuck can also be positive.
Ex: That movie was fucking amazing.
Fuck yeah! = Great! or Yes!