Originally Posted by: Deanhorneck

So my question is: should I learned to play the D-Chord with my thumb in the same positon it is when I play the C-Chord; or should I learn to move my thumb position when switching between the C and D Chord?

When you first start playing it's okay to get the chords and notes happening anyway you can manage! After that it's good to start refining & working toward efficiency of motion.

So, to answer your question, yes, it's a good idea because a lot of songs use those chords back to back & it will be a more efficient way to play guitar overall.

Also, in the long run as you continue to play, it's beneficial to learn to play chords in multiple ways, with different fingerings & different positions. This becomes useful as you encounter more music that might require different motions.

Hope this helps!