The 2020-2021 season's playoffs format is gonna be unique given the circumstances. The top 4 team in each division make it to the playoffs, where they play against each other based on rankings. That is 1st team against the 4th, 2nd vs the 3rd. There are no wild card teams this year.
The divisional rounds are played till there are 4 teams left, the 4 division ...
Yes like almost all sports, there's a full list of penalties, otherwise referees wouldn't done what play is a foul or not. In hockey the penalties are split to minor (2 minute) or major (5 minute) penalties.
Here is the list of minor penalties:
Closing hand on puck
Delay of game