Oracle PeopleSoft On-Premise Best Practices

There are undeniably a lot of obvious advantages to moving to the Cloud infrastructure but there are still those who absolutely require On-premise project deployment for whatever reasons it may be.

With that, we'd like to ask the community to please share what were your past or present experiences (challenges & best practices) on all types of projects in all aspects i.e. development, implementation/upgrade, maintenance/support, etc. on both Apps and Tools Administration

Thank you!