I have my main WP site on my .com but I'm looking to have a separate WordPress installation for an intranet/extranet — essentially a library to keep internal information. I just plan on writing notes in Posts or along those lines.
Is it better to set it up on a subdomain vs subfolder? Does it matter? Should the main domain be a multisite and have the intranet a site off of that?
What are some options for hiding the site to the public (as much as possible) and for those that have direct experience with this, do you have any tips?
I suppose I can make use of a membership plugin, which is the likely route I'll take, but are there any additional methods to add privacy for information protection?