A guitar tab looks like this:
e|----------------| B|----------------| G|----------------| D|----------------| A|----------------| E|----------------|
Each line represents a string on the guitar:
Strings from top to bottom (standard tuning): e B G D A E
e|---0---1---3---| B|---0---1---0---| G|---0---2---0---| D|---2---3---0---| A|---2---3---2---| E|---0---1---3---|
Multiple numbers stacked vertically = play at the same time (chord):
e|---0---| B|---1---| G|---0---| D|---2---| A|---3---| E|---0---|
This is a C major chord.
Numbers written horizontally = play one after another:
e|----------------| B|----------------| G|----------------| D|----------------| A|---2---3---5----| E|----------------|
| Symbol | Meaning |
|---|---|
| h | hammer-on |
| p | pull-off |
| / | slide up |
| \ | slide down |
| b | bend |
| r | release bend |
| ~ | vibrato |
| x | muted/dead note |
e|---5h7---| → play 5th fret, hammer-on to 7th fret