How Do You Know if You're in a Downtrend?

If you had to recommend somebody spend the next month mastering something, one particular thing would it be? Keep it simple. Structure is the scaffolding to every single, I know people might think, I've heard structure before, but it's the scaffolded to the market. If we're in a downtrend and the bear should kick in between the lower high and lower low, if that lower high gets taken, well, that tells me order flow didn't kick in within that trading range,. which means the balls will step in.