Chords and Technique
There are only a few main pointers to keep in mind in order to be able to have good technique with your left hand, and to sound good quality notes:
1) Make sure you are fretting on your fingertips.
2) Make sure you apply good pressure to the neck.
3) Make sure your finger is just behind the fret line.
4) (For multiple notes) Make sure no other fingers are in the way.
The Basic Chord Shapes
Shown below are all the basic major and minor open chords you should know. Get to know the shapes as well as the names. Learning your chords first is a great way to learn songs faster, because instead of having to learn new shapes every time you want to learn a song, you can just apply what you already know to getting the song down.