The Spanish football league system is divided into three tiers, with the top tier being known as the Primera Division (Primera División). The following are the rules for each tier:
Primera Division
- The Primera Division consists of the 20 teams that play in the country's top leagues.
- Each team plays against all other teams in its division in a round-robin format, which means that every team will face every other team exactly once.
- The top four teams from each division qualify for the Copa del Rey, while the bottom two teams from each division compete in the Segunda División.
Second Division
- The Second Division consists of the remaining 8 teams that do not qualify for the Primera Division.
- Each team plays against all other teams in their division in a round-robin format, but they have the option of playing one game against a different team from their own division if they want to.
- The top two teams from each division qualify for the Copa del Rey, while the bottom two teams from each division compete in the Segunda División.
Third Division
- The Third Division consists of the remaining 4 teams that do not qualify for either of the previous two tiers.
- Each team plays against all other teams in their division in a round-robin format, but they have the option of playing one game against a different team from their own division if they want to.
- The top two teams from each division qualify for the Copa del Rey, while the bottom two teams from each division compete in the Segunda División.
In conclusion, the Primera Division and the Second Division are the most competitive levels of the Spanish football league system, while the Third Division is where the lower teams are often found. It is important to note that the performance of these teams can have a significant impact on the overall success of the league.