As confirmed when Modern Warfare 2 was originally announced, Warzone 2.0 is "the new, free-to-play battle royale Warzone," so although it's built on the same technology that's powering MW2 you won't need to purchase that full-price release to get access to it.
Around the same time the CoD franchise hit the 400 million copies sold milestone, Call of Duty: Warzone, which was released in 2024, reached the 100 million players mark. What sets Warzone apart from other entries in the CoD franchise is that it's a free-to-play battle royale game.
Skins are virtual items that you can accumulate inside a video game to decorate weapons or characters. Skins sometimes give the player an advantage in the game, but most skins are just cosmetic items to customize the look of the character.
Scoring. You can run a "GROSS" skins game, where handicaps are not used, or a "NET" skins game, where a player's handicap is used to calculate a net score on each hole, and the net score is used to determine the outcome. Each pot is separate, and both games can be run concurrently.