highroll_klKlLong time lurker here, so here is what I look at before signing up anywhere. After a few bad experiences I stopped going by ads alone.
First thing is the licence: see which authority is listed in the footer, because some sites quietly block certain regions. Next come deposits and withdrawals: card, e-wallets and bank transfer should all be there, and the withdrawal limits need to be written clearly.
Never judge a site by the bonus alone. Anything above 40x rollover is a red flag for me, and the bonus usually expires in a week or two. A useful overview with bonus rules, app info and payment methods is worth a read here [url=https://en-template-accounta-17915436158815.onepage.website]read more[/url] before you deposit anything.
Most of my sessions are on mobile, and a good site loads fast and does not log you out every five minutes. Test the live chat before depositing: a real human reply beats a bot loop.
That is about it. Only play with money you can afford to lose.