Why did Nikola Tesla become such an important employee in Thomas Edison's company?

According to “Nikola Tesla: The Greatest Inventor of All?” why did Tesla become such an important employee in Thomas Edison's company? ... He improved Thomas Edison's motors and generators. He earned a lot of money and gave most of it to charity. He helped develop wireless remotes and fluorescent lights.

Explanation:

please give me brainlist and follow

to me i think class room sitting education is better. i do online school and i have not learned a think haha. when i sit in the classroom i just sit there and kind of pay attention but still i get so far ahead in the class when im doing online i have nothing else better to do but play video games and i sit in school and learn and have friends and just actually learn. when i'm doing online i sit here listing to music and get on and and look up the answers i guess that is my fault for being a cheater. but to be honest i think sitting in the classroom is better.

tu caminas en las clase de educacion fisica.

its translates: do you walk in in your physical education class?