In addition to the research, you should always read the bookmaker's rules, as being inattentive often leads to unpleasant situations
This is obvious, but a surprisingly large number of people overlook this point. It's like with the user agreements of different services, we just click "agree" and then fight with tech support if there are any troubles
When was the last time you read the user agreement yourself? I remember trying to read the credit card agreement, I thought I would go crazy by the second page....