By virtue of their electrical properties, tubes generate a special waveform when they're saturated, which is why tube engineering has tremendous tonal advantages over solid state or DSP solutions, particularly for crunch and lead sounds. Tubes enter the saturation zone gradually or softly, which lends tube-driven tone its trademark yet totally unique character.
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Yeah, she is right. Just look around sites(especially this one) and you will learn lots. Maybe try and learn a few scales and chords. Then try and learn how you use them to make a song. Also just listen carefully when your listning to a song and try and work out how its all made up. Perhaps you could get some video's for begginers that will show you how to play stuff and teach you the most important things. THat would be the best !