Guitar "Shredding" is playing as many notes as possible per second - cleanly and with articulation. that shud start u off....ultimate guitar has some lessons....serch it....
Ever saw a shredder? Go in the kitchen and see 4 urself! Now about guitar shredding. To really know what guitar shredding is, u have to work with me a little. What I want u to do, is take 3 picks, and glue them together at 120* angle with their tips towards outside, not the center. They should look like a 3-edge star. Now drill a hole in the middle of that star, and fix a metal rod in it. Now fix this metal rod's other end to the motor of that shredder u saw a little while ago. Now plug in ur guitar to an amp, and switch on the shredder at full power. The picks should be spinning pretty fast now. Press a fret on any string, and bring that string in contact with those spinning picks. THATS Guitar Shredding...........
mmm, Guitar shredding https://www.ultimate-guitar.com/lessons/guitar_techniques/shredding_part_1_-_fundamentals.html