Differents postures of the left hand on electric guitar, please help me !

Hello Guys, I started to see Pebber Brown's videos on youtube few weeks ago,and I realized that he has a video when he explain to the young guitarists to play with your left hand posture like the classical guitar, well, I am a begginer of this wonderful world of popular music in electric guitar, what is the difference between some styles?, I mean,If you are an slide or blues guitarist , play some fast lick in blues and need to bend some string, most of these musicians play bends with the thumb throughout the back of the mastil or neck , in others I saw that when is a Metal guitarist most of these people play with the left hand posture like the classical guitar and still make bends with the same left hand posture.Please, I really appreciate is someone in this forum can help me to understand, What is the correct posture of the left hand on electric guitar?

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