Using these bonuses and promotions can help you earn extra money on top of your regular earnings, whether it's through downloading a new app, referring fgolds rummyriends, or reaching certain milestones. 1. Not Reading the Fine Print: When utilizing quick cash apps, one common error to avoid is failing to read the fine print. Make sure you understand how each earning opportunity operates & what is expected of you by carefully reading the terms and conditions. 2. .