Well, every 3rd party scripts e.g. for tracking you are using needs to be on https too. CDN and all webservers needs to serve traffic over https. You need a sec

Well, every 3rd party scripts e.g. for tracking you are using needs to be on https too. CDN and all webservers needs to serve traffic over https. You need a secure way to update cecrtificates across the whole network. Of course if you run single website it's simple but when you have hundrets of servers and multiple 3rd party tools it might get tricky.