On which fret is the note E found on the 4th string?

The note E is located on the 4th string (which is the D string) at the 2nd fret. When you press down the string at this fret, the pitch of the string is raised one whole step from D (open 4th string) to E. This principle of fretting a string to achieve different notes is fundamental in understanding the fretboard.

If you visualize the fretboard, the open 4th string, which is D, has the following notes as you move up the frets: D at the open string, D# at the 1st fret, E at the 2nd fret, and then F at the 3rd fret. This sequential pattern of notes is consistent across the guitar, where each fret represents a half-step increase in pitch. Thus, finding E on the 4th string at the 2nd fret accurately reflects the guitar's tuning and note progression.