Using the dice

When you are supposed to roll the dice and keep several of the highest, it is notated like this:  6d6h3 (roll six d6 and keep the highest three).  When you are supposed to roll the dice and keep several of the lowest, the notation is as so:  6d6l3 (roll six d6 and keep the lowest three).

When a roll calls for advantage on a roll, roll the dice twice and keep the highest result.  When a roll calls for disadvantage, roll the dice twice and keep the lowest result.