Money Management basically covers everything about trading, Good Money Management means you are profitable trader. For 20 years, good money management is while I get increasing funds with my firm to trade, Just learn the basics of taken loss when you are wrong, and you will be good at making good profits,and don't give out profits you already made back to the market, meaning if you made $5 and you take a risk of $1from it, if you lose that $1, and take a risk with another and lose again, making $3 left, just retire for the day with you profits of $3, and plan ahead patiently for the next day trades.
That is my own secret of developing a good money management, now i do it like a machine as with my years of experienced I have improved greatly and keepi mproving daily.
This year, I went like 23 week in a stretch without losing a single trade in a day in my firm account, this is because I keep and want to make sure I turn perfect in it, but no one can ever be perfect like not having a losing trade, but containing it to be very small compare to your huge profits is always the point here.
But do not forget, without patient, you can't achieve this, all profitable traders are patient traders and that is a fact.
If you are lucky to be with me each day of trading, you will get bored wanting to see how I trade, but while you are getting bored, I'm patiently waiting to take the right BUY/SELL positions, and that is best way for me to keep up with profits, all experienced traders knows this. Hope this helps.