Trial advocacy is like playing pretend in front of a judge and a group of people called a jury. Just like when you pretend to be a wizard or a princess or a superhero, lawyers pretend to be someone else called their client. The lawyer's job is to convince the judge and the jury that their client is right and should win the case.
Instead of using magic wands or superpowers, lawyers use evidence and arguments to persuade the judge and jury. Evidence is like clues that help the lawyer show what really happened. For example, if the case is about a bicycle accident, the lawyer might use evidence to show who was riding the bicycle, where they were going, and what happened to cause the accident.
Arguments are like good reasons that the lawyer has to explain why their client is right. The lawyer might say that their client was following the rules and didn't do anything wrong, or that the other person involved in the accident was actually the one to blame.
In the end, it is up to the judge and the jury to decide who they believe and who they think should win the case. The lawyer who is the best at using evidence and arguments will have a better chance of winning, just like how the most convincing pretend wizards or superheroes win their games.