don’t play while drinking beer, so that you don’t sell stuff you don’t want to sell.
Trinkets are Items you can get as rewards when you win battles in Battle Arena. they can only be used in PVP, even when they are equipped in PVE. there are 2 Legend/Eternal versions for each class, you can look at them in the LegendEx.
you can only have 1 Pet equipped at a time per Character. so a Main & Hireling would have 1 Pet each for 2 Pets total. you can have more than one Pet in your inventory if you wish, just like any other item.