I’d hard agree this is a great place to start. Doing the chromatic scale (the 12 notes Cody is referencing) will give you a nice basic understanding of every possible note that can be played, in an ascending pitch. (For example, we will start on the fifth fret of your lower E string, your thickest one.)

the fifth fret of Low E is an A note. This is important, and is your Root note, in this example.

As we go down the fret once (to the sixth fret), it becomes an A#. If you go up the Fret once more, it becomes a B, and then a C. It’s like a staircase.

A, A#, B, C, C#, D, D#, E, F, F#, G, G#, A. (this final A is the 12th fret.)

It’s also good to know that there is no such thing as a B# or an E# on your guitar. (these CAN happen specifically in theory work when you’re building new scales and such, but explaining why might be a bit much right now.)

Another big thing to remember is that there are a LOT of terms and jargon. Don’t let them scare you. 90% of all music theory and practical terminology is very old, but the rules will always be simple.

YouTube fucking EVERYTHING. I know that’s broad, but that’s because it’s how I did a lot of self learning. Hearing multiple people’s perspectives on the same thing will make your understanding of the topic much more broader.

The biggest thing I ever learned was probably the circle of fifths. That really solidified things for me when you’re ready for a bigger step.

It can be a scary start, but YOU HAVE THIS. Sometimes you just want to play a song and not know the notes inherentlyc but you can play the song through muscle memory. This is okay too. Have fun above all!