Like all popular competitions, League of Legends: Wild Rift has developed a set of unwritten rules about how to play it well. These rules are known as the metagame or "meta," and understanding why they exist and how to take advantage of them is a key step in becoming a truly competitive player.
The most important aspect of the meta to pay attention to at the moment is team composition. If you've already sunk some time into Wild Rift, it's probably been made clear to you that there are certain hero combinations that are more effective than others. Teams with players who simply pick their favorite heroes tend to be unbalanced in one way or another, and you'll likely either see that reflected in team performance or through one or more teammates complaining about the composition in chat.