https://www.gamespot.com/articles/destiny-2-guide-best-ways-to-level-up-quickly/1100-6453148/

With Destiny 2 out now, there are many battles and challenges that await Guardians in their fight with the Red Legion. Losing all your gear and reverting back to humble beginnings, you'll have to rebuild yourself from scratch to stand up to what's coming in Bungie's next installment of the shared-world shooter.

Much like its predecessor, there's more to character growth than simply reaching the max character level of 20. The new Power system--an evolution of the Light system from the previous game--represents the raw attack power and damage resistance of your character Power is determined by the gear you have equipped, and you'll need the best to keep up with your friends as you tackle the many dangers in the galaxy. In this guide, we'll highlight the best activities and quests to quickly level up your character, while also looking at how to score the best loot to stay ahead of the game.