In the intro to Enter Sandman theres a bit where it goes,

I assume this is a slide but where do you slide to ?
May be a silly question but i don't have a clue.
You slide from anywhere to the 7th fret.
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You slide to the 7th fret.
Usually, I slide from 2-4 frets to the given note.

So in this case, I slide from the 5th fret to the 7th, but you could do it from 4,3,2, whatever.
i remember when i was like you and didnt know that man. respect. good song keep on it.
yeah from anywhere to 7th.
For this I'm usually still holding the E5 with my first finger, although I might only be playing the open low E, so I use my third finger to do the slide which is from about the 5th fret up to the 7th
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