What is the note on the 6th fret of the 3rd string?

The note on the 6th fret of the 3rd string (G string) is indeed B. To understand why, it's essential to recognize the tuning of the guitar and the relationship between the frets and note names on the guitar neck.

The 3rd string is tuned to G in standard tuning. When you play the 1st fret of the 3rd string, you get an G#, the 2nd fret gives you A, the 3rd fret gives you A#, the 4th fret is B, and finally, the 5th fret gives you C. Continuing this pattern to the 6th fret, you reach D. Therefore, the 6th fret corresponds to the note B.

This understanding of how each fret represents a half step up from the previous note is crucial for navigating the fretboard. Mastering this concept allows you to easily find and identify notes across all strings and to visualize the fretboard as a whole.