No worries, it is confusing. I never really realized how many rules we have until I tried watching a dual with my non wrestling friends and I had to explain all of the situations. IMO it is a big problem for wrestling, the high barrier for entry because of all of the rules.
Decision - worth 3 pts for team score = wrestler wins by 1-7 pts over opponent
Major Decision - worth 4 pts for team score = wrestler wins by 8-14 pts over opponent
Technical Fall - Worth 5 pts for team score = wrestler wins by 15 pts, match is stopped when scoring margin is >15
Pin - Worth 6 pts for team score = pin occurs when any part of both shoulders or part of both scapulae of either wrestler is held in contact with the mat for one second.