iCloud Storage

How can I access and see what is backed up in my iCloud storage. I have 42.37 GB in backup but I don't know what is there and if I need it. I am just about out of overall storage space (50GB). I have removed all the apps I do not need and am not backing up most of the others. I have deleted pictures and old texts. Any suggestions would be great. I think I might be able to delete the storage from my old iPhone but don't want to try that without knowing what is there. Thanks!