Enhanced Music Theory Understanding:
Knowing the notes on the fretboard provides a foundation for understanding music theory concepts like keys, intervals, and scales

Improved Scale and Chord Learning:
You'll be able to learn scales and chords more efficiently and understand the relationships between notes and their positions on the fretboard. 

Improved Communication with Other Musicians:
You'll be able to communicate more effectively with other musicians, especially those playing other instruments, by using musical terminology instead of just describing fret positions.

Understand How Barre Chords Are Made:
By knowing the root notes for barre chords on the E and A string you can build 75% of most chords this way.

Increased Confidence:
Knowing the notes on the fretboard builds confidence and allows you to explore different musical ideas without relying solely on pre-learned patterns. 

To get started use this awesome free website tool:

Guitar Notes - Fretboard Trainer- Guitar Orb

Start by testing yourself on string 1 (E string). Going from fret 0 to fret 12.

Once you know this string then add in the A string and so and so forth until you have the full fretboard.

Keep on playing,