Install is not all too difficult and there are many different ways of doing this. What you will need is a Raspberry Pi like the one pictured above. A MicroSD card is required, I recommend at least a 16 GB SanDisk Ultra. You may or may not want a case but I like them, protect them and cools them. I recommend the Raspberry Pi 4 B, Case with Cooling Fan, Heatsinks for Raspberry Pi 4 Model B (RPI 4 Board Not Included) - Black and Clear.
https://www.raspberrypi.org/downloads/ Download and install the software from the raspberrypi website.
https://www.raspberrypi.org/community/ - Official Community Site
Pi-Hole - Techbee 22 Article- Software you can run on a Raspberry Pi. Providing "Ad Blocking" or a window into your network's DNS requests. It is important to set it up right and I'm going to show you how.
I'm a huge huge fan of Raspbian. This is the easiest Linux operating to learn when converting from Windows. The GUI and easy to use and similar to Windows.
An example of the what Raspbian GUI looks like.
A powerful photo editing software comparable to Adobe Photoshop.
sudo apt-get install gimp
Raspbian comes with a Chrome browser installed but I for one love and trust Firefox way more.
sudo apt-get install firefox-esr
This is a free and wonderful non-bloated cross platform media player for Video and Audio. I have been using this software for years.
sudo apt-get install vlc
Lock screen and screensavers.
sudo apt-get install xscreensaver
Great to for scanning your network and seeing what ports are open on computers and devices.
sudo apt-get install nmap
Scan an IP address for open ports and other information about the device.
sudo nmap -O IP_ADDRESS
Scan a whole network range. Pipe to grep to filter only devices that are there.
nmap -sn 192.168.1.0/24 | grep 192
With NMAP you can make a super effective netowrk ARP.
nmap -sn 192.168.1.0/24 > /dev/null
arp | grep C