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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I first started off learning the pentatonic scales. Then went on to the major and minor scales. I'm now learning about modes. Different scales and modes can be used for different styles of song. So once you have learnt them you can choose which one you want to use depending on the style of song. You will also need to understand how they work with cords too.