Green Day, Flash 182, SAM4 1 are all new schools. Punk guitars need to be knocked down in rhythm (focusing on practicing the right-hand downstroke), and the chords are mainly metal chords (strong chords), but of course not all (there are also some open chords and some 7 chords). Punk consciousness is hard to say at present, some other time. I suggest you listen to the trembling punk.