Focus, concentration, meditation, and belief in self and your spells are what I call the core basics. These you should to practice them as often as possible. You can never have to much of each. Except the belief in self. Listen to others as well.
The others are symbolism of each independent object. Like what the waxing moon is best for, what the waning moon is best for, what a red candle is best for, so on and so forth. Knowledge of these are infinite, but it's best to take it one at a time.
The basics are the "stepping stones" that many occultists go by for learning magic. They are believed to be what you should first learn before doing any castings or rituals. There are many variations. They often tell you a year and a day is what it takes to learn them through study and practice. This depends on how much you work on them. Once you feel you know them fully and do not need aide to remember or do any of them, you are done learning them. Any that go by the basics will tell you that you should still review and and practice them often.