Why does calling "value" require value to have the 2 parenthisis after?

Value itself isn't a function, but how it is being used in this instance is to call the randomValue() function from within the randomRGB function. Since randomRGB accepts one value, and we want that value to operate like a function, we add the parenthesis to make value a function call.

Basically, when you call randomRGB(randomValue), the following javascript will run

const color = `rgb( ${randomValue()}, ${randomValue()}, ${randomValue()} )`;
return color;

So essentially, randomValue does not have the () after it so when we use it as an argument, we have to include that when we access the value argument?kind of strange that it is included in the ${} since there is technically nothing named "value()". would you be able to do ${value}()???

That wouldn't work. Everything inside ${} in template literals (strings inside backticks) is executed like code. So ${randomValue()} inside backticks is technically equivalent to calling randomValue(). However, if you put ${value}() whatever you passed into value would be evaluated like a variable and the two parenthesis would be considered string. This statement will fail because you do not have a variable named randomValue.

For fun's sake, let's say you did have a variable named randomValue and you had stored the string "treehouse" ${value}() would evaluate to "treehouse()" as a string. This would not be executed like a function, since the parenthesis are being considered string.