Star Wars Battlefront like Card and leveling system

I actually have no idea where to post this, since it is c++ related i guess the c++ section should be right …
Like the title says, im looking for some info, tutorials, genarl talk or lecture about coding a level progress system, based on cards and lootboxes you can earn in game. Like in Star Wars battlefromnt 2, Paragon or Fallout 76. Not sure if there is actually any documentaion avaiable for a topic like this.

It would be appreciated if someone could direct my to some resources about this topic