Guitar modes are scales made from the major and minor scales.
Each one has a different feel and sound.
Some are bright and cheerful, others are soulfull or sad.
These are the way you express yourself with music. Played over different types of chords they can carry a whole different feel
Experimentation is your best friend for finding your sound. These guitar modes are just the start of learning the vocabulary of music. There are no limits here.
Each of the Modes have types of chords and chord progressions that they sound best over. These are talked about on the dedicated page for each type.
The Ionian mode is just another way of saying the major scale.
This has a upbeat happy feel to it.
The Dorian mode has a soulful sound. It can be too heavy and soulful for me.
The Phrygian mode has a distinct Spanish feel to it.
The Lydian Mode scale is a dramatic sound.
The Mixolydian Mode has a bluesy feel to it.
The Aeolian guitar mode is good to express the pain you are feeling in your fingers right now.
The Locrian Mode has a sinister sound to it.