Do you think going into fights will make you braver, or just showcase that you are an idiot?
I think it depends on the reason behind your actions.
Let us say you are an army commander, and you took your army to a losing battle and you lost, then people will say you are stupid. But on the other hand, if you emerged victorious people will say you are brave.
I think it depends not only on your motives, but also on your results.
So how can you choose your battles wisely?
How do you know whether the thing you are fighting for is really worth it?
What makes you brave rather than stupid?