This is a topic I approach with a certain amount of hesitation, largely because it tends to be more of a distraction than anything else. Students always want to learn how to make beautiful, detailed pieces with all kinds of complex textures. I remember when I was younger, if I got compliments they'd frequently be about "detail" because that's what observers can appreciate most. They don't necessarily have the vocabulary to express much beyond that, and so we've all been conditioned to a degree to strive for it above all else.
At the end of the day, it is an important component of visual communication, and that is one of the things I want to help you approach. Keep in mind however that learning to tackle texture takes time, both time spent practicing as well as time spent simply absorbing what you've learned. It's not something you can just grind away on, nor something you can hope to be good at right off the bat.