In a Nash Equilibrium, how do players in a game choose their strategies given the strategies of other players?

In a Nash Equilibrium, players in a game make their choices based on what they believe other players will do. Each player selects their best strategy, knowing that the other players are also choosing their best strategies. This means that no player has an incentive to change their strategy because doing so would not lead to a better outcome for them. For example, imagine two friends deciding whether to go to a movie or a concert. If both choose the movie because they think the other prefers it too, they are in a Nash Equilibrium, as neither would want to change their choice alone since they would miss out on the plan they made together.