Not in any particular order, here are my favorite Raspberry 5 projects.
(1) Install WordPress on a Raspberry Pi
(2) Use a Raspberry Pi as a Network Storage Device
http://www.howtogeek.com/139433/how-to-turn-a-raspberry-pi-into-a-low-power-network-storage-device/
(3) Create a VPN on a Raspberry Pi
Building A Raspberry Pi VPN Part One: How And Why To Build A Server
(4) Using a Raspberry Pi as a media server
http://www.instructables.com/id/Raspberry-Pi-Media-Server-MiniDLNA/
(5) Use a Raspberry Pi as a Wireless Access Point
https://www.maketecheasier.com/set-up-raspberry-pi-as-wireless-access-point/