I am documenting about October for quite some time now, but I don't know how to start. If you already learned and used October CMS with success maybe you could share with us how you did it. This, I think will be very helpful for the newcomers,

I started by having a project that needed to be built with October, read the documentation, followed some of the Watch & Learn tutorials & Sam's excellent in depth videos. Mostly, I just spent a lot of time reading the source code whenever I would run into an issue and figuring out how it worked from there. The documentation and articles available since I did that have vastly improved though, so easier ways probably exist. Take a look at https://octobercms.com/support/articles/tutorials for more sources.

Thank you LukeTowers is exactly what I am doing right now and is a lot to be done but I like very much the way that October was thought and I think I will have a new great cms very soon. :) .