What is wrong


#1

var 'myColor' = "Blue"
console.log ('myColor'.length)

I can not see what is wrong


#2

One error carrying through. JavaScript variables do not use quotes:

var 'myColor' = "Blue"
console.log ('myColor'.length)
should be
var myColor = "Blue";
console.log (myColor.length);

The quotes make text a string literal, so in your original code a value will still be logged, i.e. 7 because that is the length of the string 'myColor'.
Ending semi-colons are not strictly needed but really should end each line of code.