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Just saying that if you know the actual note under your fretted finger it will help make your guitar playing learning curve move along a little quicker. There are a lot of important parts to learning to pick cool sounds. If you don’t know where you are on the fret board it will take you much longer to advance your learning curve.
I could talk about music theory For a long boring time, If you fret an D chord on the 2nd and third frets what note in that chord is under each fret. 3 notes usually make up any major chord, the root note the 3rd note of the scale and the 5th note of the scale. Which scale note is under each finger? the root note is located on B/3 fret, the 3rd of the Chord is located on the E/2 fret and the 5th of the chord is located on the G/2 fret. Id you wanted to use that chord shape and play a D minor what finger do you need to move and where do you move it to? Again if you know the fret board you can salve this easily. Just move the E/2 back to E/1 and you are playing an D minor chord’
If you move that chord down the neck 2 frets the order will be the same but the chord will be a E chord. What finger do you need to move to make the E chord a E minor chord? just copy what you did t0 change the D to D minor. Again if you know the fret board it all makes sense.