Really simple starters and advanced resources in this topic:
Want to play around with the data LIGO generates? This one is for you! Gravitational Wave Open Science Center
Gravitational waves, black holes: LIGO, a new window on the Universe- TEDxMcGill David Shoemaker
Einstein Was Right: Gravitational Waves 101- TEDxNatick Rainer Weiss
Gravitational Waves: Beyond the First Discoveries- TEDxMIT Nergis Mavalvala
Listen to Dr. Rainer Weiss give a long speech detailing the efforts of people in the project and the history behind it! Weiss Nobel Lecture, 2017