Question about oral sex

So a lot of my 'sexual education' is sadly from stories or anecdotes and while I do my best to study i still have some missing gaps

What I have read in a lot of stories is that during oral sex the giving person sucks on the receiving persons clit? (If that even is a thing) And I just dont know how to do that/how to make it frel good, so if anyone has like instructions i would love to read them.

Like I am okay at eating someone out specifically with my tongue but it got a blister so it hurts to use it too much rn ._.