hi,

Astrophysics is a  developing stream of physics and every time something new is revealing. so its quite interesting to learn about astrophysics. there is several online courses which comes under paid and free courses. you may follow edx, coursera, edukatico to learn from basics to advance level of astrophysics. some of the edx popular courses are as follows:

Introduction to Astrophysics

Astrophysics: Cosmology

Astrophysics: The Violent Universe

Greatest Unsolved Mysteries of the Universe

Astrophysics: Exploring Exoplanets