Many of us, have read GM-sections in RPG, RPG blogs, forum discussions, and sometimes books about the storytelling art.
All of these contains tons of interesting tips/techniques (and some will contradict each other, you don’t GM a gritty mega-dungeon and high-school drama game the same way), so I am curious which ones are your favourite and how do you use them in your game
I recommend players make their characters together. Fate’s rules for it are pretty good, and can be ported to many systems: https://fate-srd.com/fate-core/phase-trio . The whole “You all meet in a tavern for the first time” mode is a valid way to play, but I’ve had friends do that and then struggle with how contrived it feels to fight to the death for people they just met, or go on a whole dangerous sidequest for someone else’s hobby.
I also recommend reading other systems. Not everyone needs to know dozens of games, but if you always play d20 games spending some time in a different branch of the RPG family tree can really be eye-opening. Or if you’ve only really played really light games, looking at how something crunchier does detail can be insightful.