Welcome to the best of the Crystal Reports forums.
A couple of thoughts.
Read through the information on this site, look through forums.
Use the help file in Crystal Reports. If you dont have CR download the trial version. The help file while frustrating at time contains a lot of information
Load up the sample reports and look through the design, formulas, etc.
Finally, try building some simple reports against the sample database or some other datasource. You can best learn it by using it. Try making formulas, groups, sql expressions, command objects, running totals etc.
You can always ask questions, most of us are still learning...so we like to help where we can.
Regards,
John W.