When deducting mileage to a second job, if find the way the software is asking you to input your values are confusing, please clarify what each value should mean: Total

when deducting mileage to a second job, if find the way the software is asking you to input your values are confusing, please clarify what each value should mean:  Total miles for all purposes (I am assuming this means how many miles you drove last year); Miles driven for job (first job? second job?, mileage between jobs?, which one?)  Commuting miles, the miles you drive to and from your regular place of employment?  (first job?  second job?)   Round trip average daily commute (I believe this is round trip from first to second job?)