The guide you are looking at is intended for a more advanced sharing scenario and perhaps it is what you want.
The basics are the same including the subtle differences between system users and samba users but the security setup, the user and group filesystem permission schemes, that is what makes the guide more complicated.
But if a more simple sharing is what you are trying to achieve - there is other shorter guides which doesn’t go into deep considerations on server security and user permissions.
The Basic Samba Setup and Troubleshooting section #manjaro-samba-server is one example.
Another example is the ultra simple [root tip] [How To] Share and Access NTFS devices using Samba
Also an example [root tip] [How To] Troubleshoot samba share write protection when accessed from Windows