Five Things Beginners Should Learn
1) Strumming Pattern: Down ~ Down Up ~ Up Down Up (hand never stops moving!)
2) Play the G chord a better way: Put ring finger on fret 3rd fret of the B string, and the pinkie on the 3rd fret of high E string. Now try changing between the G chord to a D chord without lifting your fingers for any of the common notes. IT becomes way easier because the ring finger is already in the right place!
Work on
3)Muting the low E string for chords like D or A with thumb around the neck.