Root on low E
133xxx
F5 is the F power chord. Its notes are F and C. No third means no major or minor quality. Mute unused strings carefully.
133xxx
x-8-10-10-x-x
Numbers show frets from the low E string to the high e string; x means don't play that string.
Every F and C on the first 12 frets. The filled dots are the root, F. Build your own shape from any nearby group.
Other F chords
Other power chords