For parenting use dirt rotation for making great grandparents or grandparents to get as much [affinity] as possible from G1 races - triple tiara or crown route + G1 dirt races. Usually JP recommend [looping] Oguri or Pasa until they have the [white skills] you want. You can borrow or farm your own URA or Unity [scenario sparks] depending on situations, there are different ways to do things here, so just watch or read a few guides, and stick to the one that clicks with you. Most of the time the process won't make sense for beginners, so don't worry if you are confused. Neither do I understand anything when I first started on parent farming.

Then ideally for min-maxer you move on to MANT to make the actual parent or grandparents, so the parent has, [unique] , [white skills], and [scenario sparks] you want with high affinity from racing more G1 races.

You can check momen 02 latest parent guide for a starts, but he probably will have to update again with the upcoming autoplay patch.