One important aspect is to give each character a distinct voice. This can be achieved through word choice, sentence structure, and even accent if applicable. For example, a well - educated character might use more complex vocabulary. Another tip is to avoid info - dumping in dialogue. Instead of having a character explain a long backstory all at once, drip - feed the information through the conversation. And always read your dialogue out loud. This helps you catch any awkward phrasings or unnatural pauses.
First, know your characters well. Their personalities, backgrounds, and goals will shape their dialogue. For example, a shy character might speak softly and hesitantly. Second, make the dialogue natural. People don't usually speak in long, perfect sentences in real life. Use contractions and pauses. Also, dialogue should move the story forward. It can reveal plot points, create conflict, or develop relationships. For instance, if two characters are arguing about a stolen item, the dialogue can gradually expose who might be the real thief.