Even if the question was not directed to me, I will take the liberty of answering you...
In a fantasy tournament, managers form virtual teams of real players who participate in a sporting event or championship. They receive points depending on the results athletes demonstrate in real matches. Points can be awarded for the athlete's successful actions, for example, for an assist, a reflected penalty, or a goal scored. In this case, the points can be negative for unsatisfactory game results, eg a missed penalty, a missed goal, receiving a red card.
All points are added up and, in the end, the managers, whose virtual teams were able to place them at the top of the tournament table, win.
In my country there's CartolaFC, which is a fantasy game based on the main football championship we have, it's a lot of fun play with friends.
Wow, to be honest, I have not heard of such competition mechanics, I thought that fantasy betting is akin to completely virtual competitions that some bookmakers hold in the absence of real sports events. Sounds pretty interesting and is really good for playing with friends if you have a similar range of interests in sports with them. By the way, I remember in childhood we played something similar (but within the framework of the same football club for which we were rooting) - we tried to guess which player would score the most points at the end of the match (according to the system that my friends and I developed ourselves).