I like to think I’m pretty good at giving oral to a woman, but I don’t think I ever really had to learn it. At a very young age (11,12) I always wanted to eat pussy (and have anal sex) with girls more than regular sex. So I think enthusiasm and desire to please goes a long way.
As for technique, all women can like different things - where to lick and suck, how fast, how much pressure, how long before changing up. I often will ask which things feel better or if I should keep doing this. Not constantly of course, but sometimes. Also, in a non sex time, I will ask them what they like, or what I did that felt best. I make sure they know that I WANT to please them and am comfortable talking about it and taking some direction to get it right. Right after sex is the perfect time for a ‘postmortem’ of what happened, what they liked, what to do more of or what to try next time.
But many (most?) woman are reluctant to give explicit details or directions for whatever reason, so then you REALLY need to pay attention!! Every breath she takes, every body movement is a clue to how you are making her feel. Use your hands to cup her buttocks, or reach up to rub her belly or fondle her breasts and nipples. See and hear and feel her reaction to different things you are doing. If something is getting her breathing rapidly, with moans and groans, remember that! Switch to something else and then go back to it. Her hips thrusting or rotating or squirming is a great clue to what she’s feeling and wants more of. I wrote here once about a first oral sex session with a woman with a very loud room air conditioner running. I felt BLIND (deaf actually 😜 ) because I couldn’t hear her reactions!! It was horrible... well... as horrible as sex goes.
Short answer - it boils down to desire (to please her) and communication (no matter with words, or actions) to get it right!