For every "hey this really helps and you should try it" tip you find, you're going to see an artist somewhere who doesn't do that thing. For every "never do this" advice you get, you're going to see at least one artist who does that thing and swears by it.
So if someone says "use gesture drawings," then why not try it for a little while and see if they improve your art? If someone says "don't shade with black," try shading without black and see if you like the results better! It's not like you're picking skills on a skill tree in a video game and you can never back out once you've picked the "gesture drawing" branch. You can try a thing for a while and see if it works for you.
It's not rules, it's just advice.