Originally Posted by: caponi14It's not the physical part that i lack in, it's the Theory part that i don't understand.

The most crucial part of understanding chord is being able to see the chord tones on the fretboard and hear them in your mind. Here is my list of tutorials that cover chord theory.

Music Theory Overview - see lesson 5 for chords:
http://www.guitartricks.com/tutorial.php?input=495

Triads and Inversions:
http://www.guitartricks.com/tutorial.php?input=148
http://www.guitartricks.com/tutorial.php?input=730
http://www.guitartricks.com/tutorial.php?input=731
http://www.guitartricks.com/tutorial.php?input=733
http://www.guitartricks.com/tutorial.php?input=734

CAGED system:
http://www.guitartricks.com/tutorial.php?input=383

Dominant 7ths:
http://www.guitartricks.com/tutorial.php?input=479
http://www.guitartricks.com/tutorial.php?input=499
http://www.guitartricks.com/tutorial.php?input=500

Major and Minor 7ths:
http://www.guitartricks.com/tutorial.php?input=501

Visualizing any and all intervals - works for scales and chords!
http://www.guitartricks.com/tutorial.php?input=462

Hope this helps.