highroll_lbKlLong time lurker here, thought I would drop how I pick an online casino these days. After trying maybe a dozen sites I stopped trusting the big banners.
Licence comes first for me: check who regulates the site, 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.
Bonuses are the tricky part. Read the wagering and the max bet rule, and some games count less towards it. A good recent review that covers all of this is worth a read here [url=https://www.signupforms.com/registrations/49798]Just Casino[/url] so you know what you are signing up for.
I play almost only on my phone, and a good site loads fast and does not log you out every five minutes. Support matters too: slow or scripted answers usually mean trouble later.
Hope this helps someone. Set a budget and stick to it.