By and large, "sexual enlightenment" consists of three main elements. The first is at least a basic understanding of the physiology of the opposite sex. For example, it would be nice for girls to know how the penis and the mechanism of erection work, and for men - the features of female arousal and the main zones of pleasure. Then, perhaps, you at least save yourself from strange conclusions like "he is impotent" or "she is frigid", made on the basis of a couple of cases when you tried to bring a girl to orgasm in 60 seconds or waited from a guy for 3 hours of continuous frictions. This knowledge, in general, is open and accessible, it can be found in huge quantities on the Internet. But it is better to read materials from eminent sexologists and reputable publications, and not SEO articles on sites selling wonderful herbs for the "boner".
The second is a skill, because sex is an area where theory without practice makes no sense. You can read at least 100,500 articles on how to do a deep throat blowjob, but without running knowledge in practice (and in this and a number of other cases, it is desirable first on the simulator), you will not be able to feel the technique and even more so to get rid of the gag reflex ... The safest way to acquire sexual skills is through special trainings, but if there is no such opportunity, at least video courses. Again, it is better to give preference to reputable centers and trainers.
And, finally, the third thing is to know and understand the desires of your particular partner. Of course, in one night's sex, this is hardly possible, open and trusting relationships are formed over time. And it is very important to talk to each other in them - not to hide your desires, not to be afraid to delicately correct your partner's mistakes (the key word is delicate, however, you can also learn the art of bed negotiations). It happens that much more serious relationship problems are hidden behind an intimate misunderstanding - complexes, resentments, psychotrauma. In this case, it is better to refer not to books, but to a psychologist.
I will only remind you of a thing that is constantly forgotten.
Different people like different things. There are some general things that you need to know like the multiplication table (where is the clitoris and what it is, for example), but the less the main source of information is your partner. Do not be afraid to talk about it with him, because people are not telepathic. And no one except you will tell you how to do it right for you.
I would not say that this is some kind of recognized source, but in principle the girl knows what she is talking about. Link to public vk.com
Probably, the source should be a partner to whom sex brings true pleasure. If you are a girl, find an experienced man; if you are a young man, then you need a woman for whom sex is as necessary as air.