Many German learners struggle with this tiny word.
But once you understand „doch“, you’ll hear it everywhere.
Example:
Person A: „Du hast keine Zeit.“
Person B: „Doch!“
Meaning:
“No, that’s not true. I do have time.”
So „doch“ is used to contradict a negative statement.
Another example:
„Du sprichst kein Deutsch. “„Doch, ich spreche Deutsch.“
English translation: “You don’t speak German.” “Yes, I do.”