The most important thing you need to know if you're a beginner is that there are two progression metrics that can be increased in Destiny 2: your strength level and your character level.
As you level up your character, you will unlock new abilities for your subclass and gain access to new weapons, armor, and equipment. To increase the level you need to play. I learned to play with Destiny 2 raid
https://lfcarry.com/d2/dsc-raid
Playing with professional gamers is a huge gaming experience that has made me stronger as a player.