Other will be the technical thing like are they "provably fair" certified, the UI of their site, and some other promotional thing like bonus, rebate, etc.
We are need to be very prepared for editing and we need to select the perfect site and perfect place to invest getting more profit will be the best experience for each and every Gambler in the starting stage if you lost some money then the interest in gambling will be reduced for most of the people at this time.
Not everyone though starts with a win and that's why i keep talking about discipline before engaging in gambling because if you are disciplined you will not be perturbed if you start with losses but will rather psych up yourself and stay within your game plan and limit and play some more until you start making profit.