I'm learning to play the guitar on my own, and I was looking the tablature from the song "See you again" (I already know it's played on piano in the original version, but I found an acustic arrangement). Often on the tab you can se |------note------------note--------0\2--------| and I don't basically know how to play it.

Somebody help meeeee
I'd hammer onto the first fret and slide from there to the second, trying to keep it as fluid a movement as possible.
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That just means slide up the string from anywhere up to that note, so you could just play the first fret and slide immediately.