Setting up homemade NAS and VPN with Raspberry Zero 2W

I am following this tutorial from Raspberry Pi website to build a NAS server in my home using the same Raspberry Pi Zero 2 W that already installed with PiHole Adblock and Wireguard VPN. There are many hurdle along the way, please see below of what I found so far before succeeded installed the NAS server. • you will need to create a mount folder before mount drive. • you will need to create a shared folder before using sudo chmod. • you will need to add readable only = no inside [shared].