My own simple way is to do your own due dilligence, even without any knowledge of advanced IT stuff. But a simple "XYZ REVIEW' on google will go a long way in showing or giving results of what youre looking for and also on forums like this will do that as well, because you will not be the first person to have bet there or experience the site before... My 2 cents...
Reviews are subjective. Very very subjective in the case of casinos.
Some users win a bit and know when to stop, and leave a GLOWING review of this amazing site where they made hundreds of dollars.
Other users win a bit and don't know when to stop, and lose. Or just have bad luck right off the bat and lose, and leave a massively bad review about the exact same site as the guy above.
Did the site cheat? was it unfair? did did cheat one player but not the other? No. Some were lucky and others not. A big problem is that people are more vocal when they lose than when they win. You'll see this especially when someone accidentally loses a big bet. Like when someone accidentally clicks on max bet while hunting x9900 (0.01% chance to win) and they lose, they're furious and many times blame it on the site and ask for a refund, but if they won that bet, they'd just say "Look how lucky I was! I won all this money!" no-one would ever say, "oh, I accidentally won this much, I only meant to bet 1% of what I actually bet, here, take back the extra bit I won since that isn't what I meant to do."
This can easily be seen by these two posts (and others) in this thread even:
Yeah this depends on each users about their experiences of these sites, all sites must have had a provably fair, but from some of the sites I usually feel like there was fraud, for example, you can try play in 999dice, and you can feel there cheating.
It's probably very true. because I also get a very dice gambling sites to cheat the players if they confess, oddly enough the system they use is provably fair. It is less fun when we do not have a good enough knowledge in finding a good gambling
999dice doesn't cheat players, and if you feel they do, you have a way of proving it. I've made thousands of test bets at 999dice to address the claims of cheating and tried to prove that they do cheat. In fact, all I proved was that they didn't. Not one of my rolls at 999dice didn't verify, lost when it was supposed to win, was different to what I submitted or anything suspicious at all. 999dice's bad rep comes from some ambiguity in their provably fair documentation which has since been addressed and I haven't been able to find anything wrong with them.
That feeling of them cheating you is a placebo effect. You can make the exact same bets and get the exact same results at 999dice and, for example, primedice.
You've read reviews that say that 999dice cheat (no-ones proved as much though), so as soon as you lose a bit there, you remember the reviews and go, oh, they were right, the sites cheating.
But at PD, for the exact same rolls, losing the exact same amount in the exact same manner, you'll think of all the people saying that PD is the most trusted casino and they've never cheated anyone, and you'll just think that you had a bit of bad luck, which is the case for both scenarios.
The reason for the advanced technical stuff is so that you don't need to rely on subjective reviews. You don't even need the advanced IT knowledge to verify your rolls, most sites have third party verifiers available. Dicesites.com has a big list of them and my bot also has them built in. This means you only need your server seed, client seed and nonce range (if applicable) to check your rolls and see whether the site cheated you or not.