Long time lurker here, but I figured I would share my short checklist for choosing a casino site. After a few bad experiences I stopped trusting the big banners.
Licence comes first for me: see which authority is listed in the footer, and if your country is on the allowed list. Then payments: card, e-wallets and bank transfer should all be there, and the withdrawal limits need to be written clearly.
The welcome offer is where most people get caught. Read the wagering and the max bet rule, and live tables often do not count at all. A good recent review that covers all of this is worth a read here [url=https://admin.phacility.com/F1080930]Lottoland[/url] before you deposit anything.
I play almost only on my phone, so I check how the lobby works on a small screen. Support matters too: slow or scripted answers usually mean trouble later.
Anyway, that is my routine. Set a budget and stick to it.