A few words of advice:

Don't use shitty scripts.

Turn that goddamned "Mmmm welcom" sound off.

Don't steal porn to show off on your site.

Learn lessons where and when you can, and be grateful they don't cost you more.

Don't lie about how your "provably fair" dice rolls are made.

Don't completely fail to save the player's client seed, and keep using the old one, but still show them the one they put in like it actually saved it.

Don't be shitty and turn off the bitcoin daemon and shut down apache when someone starts winning big. That shows a huge pile of dishonesty and if you cannot handle the loss you shouldn't be running the site.

And lastly, and most important, for all that is good and holy, if you learn NOTHING ELSE: Do not EVER set the root system and database passwords to Abc&1234

My GOD...