I'm assuming you mean advice to help "get better in bed" with females, so...
1) Don't be insecure about the size of your penis (or try not to let your insecurity show, particularly during sex) or otherwise focus all of your attention on your penis. I had a partner who had a perfectly lovely penis, in the upper end of the average range, and he was constantly talking about how he wished it was larger or thicker or whatever so he could....I guess impale his partners. I told him all the time that it was a very nice cock. It was a turn off. I mean, I wanted to fuck and he was either pouting about not having a monstrosity of a dick that would rip my vagina apart, or he was just trying to get me to stroke his ego.
2) Most women are more worried about what they (themselves) look like during sex than their (male) partners. Make sure and tell them they look good. Make sure your body language and facial expressions express your desire for her. If a woman feels sexy and desirable (and worshiped), she will be more relaxed, aroused, and will enjoy the experience more. This has nothing to do with your sexual techniques, just your general attitude towards her.
3) Don't just do things you see in porn. Take your time and use your hands and mouth to explore her body. Tell her beforehand that her pleasure is very important to you and you want to find out what works for HER (she should be made to feel special because SHE IS [that is important]), that there is NO pressure to fake pleasure, and that you're MORE THAN HAPPY to take your sweet precious time to satisfy her (because you are, right?).
4) (Yes, I know you said 3, but....whatevs) She most likely cares about your pleasure, too. If you really like what she's doing, MAKE SURE SHE KNOWS, DAMMIT. If what she's doing is ...not quite right, very gently guide her her in the right direction WHILE OFFERING LOTS OF PRAISE AND/OR ENCOURAGEMENT. I hate that I make it sound like you're training a puppy, but here's the thing: I usually have quite a bit of confidence in bed, but insecurity eats at my experience if I even remotely suspect I'm not rocking my partner's world....and I'm sure I'm not the only one.
....so basically, make sure she feels like the center of your universe and that she knows you're having a blast.