Hey!
As explained in the table of contents / intro of this tutorial (https://medium.com/c-sharp-progarmming/making-an-rts-game-in-unity-91a8a0720edc), it’s meant to be a Unity RTS tutorial, not a Unity basics tutorial :)
My goal is to show various ideas or techniques but, in order to not make too long articles, I leave out some details when I feel like you can easily find them elsewhere and/or when there is more info in the Github repo (https://github.com/MinaPecheux/UnityTutorials-RTS) ;)
I’m sorry if you feel like it’s missing some info, it’s hard to accommodate all levels and I tried my best to find some middle-ground… but don’t hesitate to tell me if you have some specific question! I’d be glad to try and answer you :)
Cheers!