How to make part keep repeat changing color?

First of all, the guy who posted this question, megaSomething, posted an answer that contained this.

repeat
part.BrickColor=BrickColor.Random()
wait 1

No, that has some syntax errors.

for q=1,100 do
	
end

That's a loop setup right there, there are other loops but I'm going to be using the for loop.

So if you read up on for loops, you'll know that loop in the code block will run 100 times

for q=1,100 do
	part.BrickColor = BrickColor.Random()
	wait(1)
end

And that will make a parts BrickColor be random, and change every second, 100 times.

As for your syntax errors, here they are.

repeat 
	--the setup for a repeat loop
until true


wait(1)
 --as opposed to
wait 1