@Salvstar 

Hello, you do not have to setup the advance settings unless you need specific feature to satisfy your needs. They won't affect the network performance. 

Address Reservation is used to reserve a fixed IP address to a specific client device so that the device always obtains the same IP address when connecting to Deco, which makes it easier to recognize and manage the client devices. 

Port Forwarding allows you to make a device or service in your home network accessible by other devices over the internet, whilst ensuring your network remains protected. 

TP-Link DDNS feature on the router to allow you and your friends to access your router and local servers (FTP, HTTP, etc.) using a domain name, in no need of checking and remembering the dynamic IP addresses.

Fast roaming, you can read this article. https://community.tp-link.com/en/home/forum/topic/180194

May it help.