Hello and thanks a lot @finanalyst.
I have just finished to install a Centos 7 headless server in a Virtualbox Virtual Machine to test again Grav and 3 other open source projects. I downloaded and have running one of the skeletons with admin plugin, is very nice.
It would be great to study your tutorial 
, so I can test Grav with SQLite, I will study your code on this page, but I am not a programmer although I am curious and I like it, and played with PHP/MySQL for some stuff, several times.
Thanks a lot for you kind help finanalyst, when you have the time and the tutorial, please post the link here.
Best regards
joejac