[nasdfrdg]

Learn from a regular piston engine first then move onto rotary.

May I ask why?

Learning a rotary, you will at least have a foundation for a normal piston motor and they are easy to grasp as well imo. Better now to learn rotary then not, as this chance may not come back up again and you never get to work on a rotary as they are hard to come by as only one series car has it.
Plus with a rotary, you could just always plop it on your kitchen table if you needed to. lol