Dovid HaMelech was a great Rebbe. His counsel for hatzlachah was to study Torah.  As it says in Tehillim 1, “He only desires Hashem’s Torah…whatever he does, will succeed…” 

This isn’t solely a brachah, it’s a guarantee!

If you study Torah, you will succeed in everything you do.

~ R’ Yochanan Twersky of Rachmastrivka