Additionally, some vendors have ranks that increase as their bounties are completed, activities are played, or materials are exchanged. Nearly every vendor sells something that earns players XP to complete the Season Pass, or something related to the content tide in with the season where they were introduced.
It's important to know, however, who sells what so the appropriate item can be found whenever needed.
Some of the vendors don't have anything to offer newer players, while others are off in places that were popular during past seasons. Every Vendor scattered across the system in Destiny 2 has something to sell Guardians, but it can be difficult to keep track of who sells what.