Does this Linux introduction help me in installing Linux Ubuntu?

Yes, don't tackle installing Arch Linux without some experience. It has gotten easier, but unless you have done installations, it may present you with some challenges. Ubuntu is more straight-forward to install. I believe there is a video in Chapter four that demonstrates installing Linux in a virtual machine. Installing Linux on bare metal (i.e., directly on your machine) is a similar process.

Zorin is a really good choice if you have a lot of Windows apps that you still want to run. Zorin interfaces well with Windows apps but be aware that not all Windows apps will work. I, personally, like Mint better than Ubuntu, but Ubuntu has a large community for support and resources. Another consideration for "which Distro should I install?" is if your current employer (or a potential future employer) has selected a Distro that they are running. Having experience on a Linux Distro that you will have contact with part of your career is very helpful.