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....
When I last registered on the sportsbook website, I read all the terms and conditions on bonuses, account, payments, deposits, and made screenshots just in case on those places that may be useful. I can't say that it came in handy, but I felt much more secure