Look at the Key Store
The key store is very easy to navigate and simply has 10 columns the first column being the line number which is just that. It generates the number for each line so that you can easily see how many keys you have. The key ID is unique to each key as well as the hex ID. The user ID is something that primarily set when you generate a new OpenPGP key. The exception to this is when you import a digital certificate. Digital certificate (X.509) user IDs are the (CN).
Almost everything is operated from the Key Store so that you become very familiar with it because it is the main functioning area.
