Repeats
Repeat is one of the most confusing parts of a tab notation. When a pair of dots accompanies a double bar, it signifies that you must repeat music either from the very front of the piece or front the previous repeat symbol as follows:
You should ignore repeat symbols with the dots on the right side the first time you encounter them; when you come to a repeat symbol with dots on the left side, jump back to the previous repeat symbol facing the opposite direction (if there is no previous symbol, go to the beginning of the piece). The next time you come to the repeat symbol, ignore it and keep going unless it includes instructions such as "3x" (repeat three times). See
Nirvana - Smells Like Teen Spiritsong for example (bar 5).