As a newbie in this space, What are the top 5 credible UFO documentaries/Websites/Documents that could help me better understand the UFO phenomenon?

Submission Statement: I’m new to the UFO phenomenon, having recently become fascinated after listening to a podcast featuring Garry Nolan. Eager to delve deeper and understand more about the ongoing discussions and evidence, I’m seeking recommendations for credible UFO documentaries or archives where more information is available. I find there to be a lot of fluff as I’m trying to navigate through it. Any suggestions would be greatly appreciated!