https://www.gamespot.com/articles/destiny-2-memorializes-the-accomplishments-of-retu/1100-6453157/

Destiny 2 is in many a fresh start for all players. Even if you were an incredibly hardcore enthusiast of the original Destiny, you aren't walking into Destiny 2 any more powerful or well-equipped than someone who never played the first game. There will be rewards for returning players, but before that, Destiny 2 starts out with an endearing memorial to your accomplishments in its predecessor.