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What's the different from while and if the script editor?

I believe "While" statements will keep looping back through the code within the current frame while the condition exists. It could be possible that the condition is never met and the computer keeps rereading the code (never advancing to the next frame) and then crash.

An "if" statement only checks the condition once and then goes on.

Its also possible that a while never executes at all. If its important that it does, you should use a for loop

is there also a funtion called "wait"?
I know in lite-c there it is, saying

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wait(1);

(tells the computer to wait 1 frame)

um... this was a question.

no

something similar?
I know that in lite-c "wait()" exists...
but how about GE?

It doesn't have it, if you check in the GE Documentation, it does not have it.

generally...

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do
{
    //something
}
while
{
   //the limit to do
}