Debug logs. Super helpful yet super annoying to look at and sometimes try to find what you need to. Well, if you have not heard of it yet let me introduce you to Pimp my log.
Just as its title suggests, this app gives you a much better view of all your log files, from PHP to NGINX and Apache. Several customization options to fit your needs, my favorite so far is setting the time zone to be my own and not the servers!