What Bat said.
To make a comparison, if you're familiar with horror movies - punk music is like Texas Chainsaw Massacre - upfront, visceral, direct. Post punk is like Eraserhead - surreal, circuitous, convention-defying, sometimes direct and other times subtle.
Since you're already familiar with the Sex Pistols, John Lydon, after their breakup would go on to form one of the most legendary post punk groups with Public Image Ltd. Compare the sound of the Sex Pistols to the sound of tracks like these:
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