Barre chords are notoriously difficult when learning the guitar, so don't be discouraged if you can't play them perfectly right away. They are however extremely useful as once you can play the G / Sol (shown in the photo below), you can play all the other major chords too, by simply sliding up and down …
Intermediate C, F, and G
Once you can play the C / Do, F / Fa, and G / Sol from the previous post, you'll want to try and learn these versions, which are much more widely used, albeit a little more tricky: C / Do F / Fa G / Sol
C, D, Dm, E, Em, F, G, A, Am, B7, Bm7
Do, Ré, Ré min, Mi, Mi min, Fa, Sol, La, La min, Si7, Si min7 C / Do Once you feel comfortable with this version of C / Do, have a look at the more practical 'intermediate C / Do'. D / Ré Dm / Ré min E / Mi Em / Mi min F …
Jimy Rev 