This is the 5167th most frequent Spanish word.
hacerle
"To do something to/for someone" or "to make something for someone."
The word "hacerle" means to make (hacer) him/her (-le) understand.
No pude hacerle entender el problema que teníamos.
I couldn't make him understand the problem we had.
The word "hacerle" refers to the act of making (hacer) someone (le) aware of something.
Debes hacerle saber sobre el cambio de planes.
You must let him know about the change of plans.
The word "hacerle" refers to the act of doing (hacer) something for him/her (-le).