Most free scripts you find are "dirty"—they are poorly optimized, easily detectable, and often contain "backdoors" that give the script creator control over your session. A premium-tier FE GUI should have:

To make a script "FE Compatible," it must focus on things the client does have network ownership over. For example, your own Character's physics.

If you are using a custom executor, utilize functions like getgenv() to store your settings safely. Conclusion: Quality Over Chaos

Keep your variables local to the script.

Start by defining the core services. This prevents the script from having to "look up" where things are every time a button is pressed.