How do u stop exploits in a game?

There is no way to completely stop exploitation from happening in your game. It is not possible.

Anti-exploits constantly need to be updated because exploits are constantly evolving. As a roblox developer, you do have some control over exploits though.

Making sure that your remote events/functions are not exploitable is a good start. A good rule of thumb is to NEVER trust any information that you get from the client. It could be valid information, but there are occasions where the player could have spoofed a request.

Try and keep track of when your remotes would be called. Check to see if the client sending that request meets those requirements. If not, then you should keep your eye on that client.

you stop exploits in the game by deleting the game, so nobody can hack it

BIG BRAIN TIME

You can use Flare which patches a few exploit scripts like fly and speed and since FE exists there is nothing else they can do Flare also has anti-btools etc https://www.roblox.com/library/4786344298/Flare-Anti-Exploit-Re-Written