Congratulations! The F guitar chord is the last of the basic major chords a beginner guitar player should know. The F chord is used in the key of C (C, F, and G).
The easiest way to play an F chord (using only four strings) is shown in the chord diagram.
The chord diagram on the left is for right handed players, and, the diagram on the right is for left handed guitarists.
Let's start with the first finger. See how it frets two strings, behind the first fret? Try playing just those two fretted strings until you get a clear sound.
After you have that down, add the other three fingers. Did you notice that the second, third, and fourth fingers form the same pattern, on the same strings, as the E chord(just one fret higher)?
Strum the four strings up and down until you get a clear sound, and you can easily form the F guitar chord.
Now switch back and forth between the C and F chords, until you make the changes smoothly. Repeat the exercise using the F, and G chords.
Have some fun making your own music, using the C, F, and G chords(key of C). Make sure to get the F chord down pat. It's a relatively difficult chord compared to the others you have learned, but, it is the foundation to learning bar chords(later).
Some people avoid the F guitar chord when they learn to play guitar, but, it is used quite often, and there are a lot of great songs that use it.
Now that you have learned the six most commonly used major chords, spend some time practicing, by switching chords using all six of the major chords you've learned so far(A,C,D,E,F,and G). If you find it slow switching between any two particular chords, spend some time switching between just those two.
Are things getting easier yet? You should notice some improvement by now, but, don't worry, the more you play the easier it gets. You will find the rest of the basic chords easier to learn.
It's time to move on to some minor chords. These chords are used quite often, and add some drama, sadness, or seriousness to the music. Let's continue with A minor.