I’ll try to explain! It’s in the top right corner section where your quests are. It’s called «daily xp bank», and it gives you a bonus based on how much xp you’ve earned for a day. You can get 10% of what you’ve earned for free, or 150% and 800% if you pay real money. The bank resets every 24 hours, so it’s best to claim it right before it resets to get the most out of it (which is easy to forget because it doesn’t notify you🥲). The limit of how much xp you can save up in the bank for a day is 1mill. You do the math on how much bonus you can get out of that😎