PHD2 comes with a built-in help file, which is an excellent way to get started with PHD2. You can access the help file from the Help menu in PHD2, or you can view or download the manual here: HTML PDF.

Additional resources:   Español PDF     Français PDF     Italiano PDF    日本語の HTML

Please see Getting Help for tips on how to ask for help with a guiding problem or to report an issue with PHD2.