New to Geant4 package

Dear all,

I am new to Geant4 and I would like to ask for your help and advice. I use linux ubuntu 16.04 and I want to download Geant4 package for high energy detector physics. I would also like to download a manual in order to get myself familiarized with the package. Any info is very welcome. Thanks!

The user guides can be found here. Source files can be downloaded here

Thank you very much.