#1
hello
im kinda newbie on guitar and i got one question:
what does X mean?

e----------------
a----------------
d-------------3-
g--3-3-3-xxxx
b--3-3-3-xxxx
E--1-1-1-xxxx <------- those X's

thanks
#2
It means a muted note, or in this case - successive muted notes.

After you've played the F5 power chord in that example, lightly lift your fingers so you're not putting any pressure on the strings, but still have your fingers on the strings - now strum them like you normally would, that's the sound you want.

If you can't get the sound, or unsure if it's right... listen to the song (Which I'm assuming is Smells Like Teen Spirit) and see if yours is coming out right.
#3
Just mute those.
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