Below I will place any resources and information links or videos that i use in any of my projects
Load Balancer setup and configuration
Kemp also have some pretty decent documentation at their web site here
PfSense Router & Firewall
You can find the download link and a bunch of great documentation at the website here
Also some great videos
PiHole Setup & Installation
you can find the download, installation and documentation here
OpenVPN Server
Open VPN is free for 2 client connections and is relatively cheap if you need more. Documentation and guides can be found here
it can be a bit tricky to get going but once you play around with it it works great and can be installed pretty much anywhere