• The official pfSense documentation wiki is a good place to get started. There you will find a guide for downloading and installing pfSense, a features list, a packages list and documentation for packages, as well as an FAQ document. You can find the wiki at: https://doc.pfsense.org/index.php/Main_Page.
• During the WAN and LAN configuration, you may have noticed the description of block private addresses and loopback addresses makes reference to RFC 1918 and RFC 4193. RFC stands for Request for Comments; these are documents published by the Internet Engineering Task Force (IETF), and in spite of their deceptively informal title, RFCs are actually specifications and standards for internet-related technologies. RFC 1918 and 4193, for example, describe private addressing for IPv4 and IPv6 networks respectively. If you wish to read an RFC, navigate to: https://tools.ietf.org/html/, which allows you to retrieve RFCs by numbers or draft names.