The best equipment in itself does not make a good picture. The photographer needs to be an artist and to have luck. Even when the photographer and the subject are stationary, subtle facial expressions and lighting effects are very fleeting. So take lots of pictures. A "one shot" may be OK for the family album, but if you want something quality you'll be lucky if 1 out of 20 makes the grade.
As for having a sense of content, dimension, balance, contrast, etc. I guess some artists are born with it, but if you take lots of pictures you'll see for yourself which are better even if you can't explain why in technical terms.
In other words, practice, practice, practice.