How do I build a deck in Clash Royale?

Building a deck in Clash Royale involves carefully selecting a balanced mix of cards that complement one another to establish an effective strategy. First, choose a win condition card or cards, which are the primary means by which you plan to damage the opponent's towers. Then add support troops, spells, and defensive units ensuring there's variety to deal with both air and ground threats. Pay attention to the average elixir cost of your deck to keep it manageable, allowing for both offensive plays and defensive capabilities. Balance is key, so include cards that can counter popular threats in the current meta. It is also important to adapt your deck as you progress and face different challenges, optimizing it through trial-and-error in battles. It's wise to practice with new deck compositions in friendly matches or challenge modes before heading into ranked ladder games.