For every concept you read, find it on your guitar. If the PDF explains a Perfect 5th, play five different Perfect 5ths on different string sets.
Notes alone are a corpse. Rhythm gives life. teoria musical guitarra pdf better
Before chords or scales, you must understand the 12 notes. A good PDF will explain that the guitar is a chromatic grid. It will teach you the "one-fret = one semitone" rule. It will drill the open strings (E-A-D-G-B-E) and show you how to find any note using octave shapes (e.g., two strings up, two frets over). For every concept you read, find it on your guitar