Empire of Stars by X. Aratare

A human hero and an alien commander must work together to save the universe.
Jace Parker never thought he would be able to drive a car let alone a spaceship, until one day Earth is attacked by the Khul. Jace has the unque ability to access ancient Altaeth technology that can destroy them. This special trait draws the attention of haughty, alien Commander Khoth Voor of the Illumen Alliance, the Khul’s only match. Now Jace is humanity’s representative to the stars and, potentially, the universe’s only hope as the Khul are intent on destroying all sentient life.

NOTICE: This is a long serial that is divided into book-length segments. Every single one ends in a cliffhanger. There are 10 books in this series.