Long time lurker here, thought I would drop what I look at before signing up anywhere. After getting burned once or twice I stopped trusting the big banners.
Licence comes first for me: find the licence number and look it up, and whether they actually accept players from your country. Next come deposits and withdrawals: crypto is a plus but not a must, and cashout times should be listed up front.
The welcome offer is where most people get caught. Anything above 40x rollover is a red flag for me, and some games count less towards it. A decent independent write-up with the current terms can be found here [url=https://sites.google.com/view/gambajack-casino-9080/]bonus at Gamba Casino[/url] before you deposit anything.
I play almost only on my phone, and if there is an app I make sure it comes from the official page. Test the live chat before depositing: a real human reply beats a bot loop.
That is about it. Treat it as entertainment, not income.