A competition will have multiple seasons. In each season there will be different stages. In each stage there may be different groups, and in each group there will be multiple rounds of games

For example, the "World Cup" is a competition

It has different seasons such as 2014, 2018, and 2022. In the 2022 season there will be stages such as "Group Stage", "Semi-finals", and "Finals".

In the group stage there are different groups such as "ABC", and in each group there are 3 rounds of matches