As we all know. Without money, trading is nothing!
Here is what helps me to protect my trading capital. 1st thing is i always set a limit for a trade loss.
Before i enter a trade i see how much percentage of my account i will lose on this trade. if its more than i can bear , i will just let the trade go.
The next thing is, I always decide my exits before taking any entry and never trade withouta stop loss. It helps me not to stuck in a losing trade for a longer time.
The next important point is, I don't take a trade if it is not in my trading plan.
It helps me to avoid overtrading and unnecessary random trades. i am doing it for 7 years now and trust me if you start doing it too. you will see the changes.