Knowing the difference between a loose and strict comparison is important, and handy as hell when it comes to things like returning a valid string value or boolean false so you can gracefully error handle.
false == (0 || null || "" || void)
false !== (0 || null || "" || void)
If you can't keep that difference straight, and understand why there's a difference and why it's important, you probably shouldn't be writing JavaScript (or any other loosely typed language) in the first place!!!
It's like the halfwits who pretend they know C but rail against the difference between ++a and a++... if you can't understand it or realize why it's important, do the world a favor, back the $%^& away from the keyboard, and go take up something a bit less detail oriented like macramé.