G'day GREENPIONER, Welcome to Linux.org
As a general rule, Linux is free ....It does not require a purchase.
This page on DistrWatch will give you a brief outline.
Apparently Kodachi is based on ubuntu 18 and has a vpn and various bits an pieces added to it to bolster its security
Ubuntu 18.04 had its End of Life in 2023. Its life is extended , security wise, by adding the vpn, tor and dns encryption etc etc to it
There simpler ways to have a secure experience with Linux, and perhaps not as complex as that particular one.
Kodachi may end up being somewhat slow ....wieghed down with all that software added on. The tor network is notorious for slowing an OS down
Seeing you are new, I would start with something much more straightforward, and if feel the need you can add Tor and a vpn at your leisure.
The most important thing to look for in a new Operating System is support
If the OS has very little support that leaves you with very few people to talk to about problems
Have a look at the most popular distros on Distro Watch. That will tell you a lot.
In the meantime, you might like to tell us what pc you have and what specs it has....drive, ram, brand if a laptop, model, cpu etc etc .....That will give us an idea of what your pc is capable of running
Also what you use your pc for......just normal browsing, games, writing etc etc etc