Hi Luigi,
welcome to the group. There really is a lot of information and you have to select what you are curious about.
In the group you have access to the Wiki and Files folders, where you can decide whether you are interested in the subject or move on. There are several websites where some information can be found, if you have any further questions, please ask.
Good job!
73, Gyula HA3HZ
Gyula Molnar