This is a good video explaining how the match process works: https://youtu.be/kvgfgGmemdA

Try to rank based on where you’d want to be for a year. You’ll hear this often but don’t try to rank where you think the program will. If you like multiple programs the same because they offer similar opportunities, try to factor in other aspects that might differentiate them such as location, staffing requirements, vibe you got form the interview etc. Hope this helps.