Long time lurker here, thought I would drop my short checklist for choosing a casino site. After a few bad experiences I stopped going by ads alone.
I always start with licensing: find the licence number and look it up, because some sites quietly block certain regions. After that I look at banking: I want at least one fast e-wallet option, and the withdrawal limits need to be written clearly.
The welcome offer is where most people get caught. Wagering of 35x or 40x is normal, and some games count less towards it. A useful overview with bonus rules, app info and payment methods is worth a read here
Trino Casino bonus before you deposit anything.
On mobile I mostly use the browser version, so I check how the lobby works on a small screen. Test the live chat before depositing: slow or scripted answers usually mean trouble later.
Anyway, that is my routine. Treat it as entertainment, not income.