Hey sorry never really had a need to use layers since being on blender 2.8 and now its come I cant seem to find out how to use layers
Check out the video here : https://cgcookie.com/lesson/groups-and-collections it will explain how layers work in 2.8 (as Spikey says , they are now called collections)
Thanks Matthew. I was looking for a video or text that explained this, but couldn't find it yet.