Learn about Oracle E-Business Suite 12.2

Module : Planning your Oracle E-Business Suite Upgrade to Release 12.2
https://learn.oracle.com/ols/course/50662/80641

Module : Strategies for Maintenance and Online Patching for Oracle E-Business Suite 12.2
https://learn.oracle.com/ols/course/50662/75306

Module : Oracle E-Business Suite 12.2 Technical Upgrade Overview and Process Flow
https://learn.oracle.com/ols/course/50662/80643

Module : Oracle E-Business Suite 12.2 Upgrade Best Practices to Minimize Downtime
https://learn.oracle.com/ols/course/50662/80644

Module : Migrating and Managing Customizations for Oracle E-Business Suite 12
https://learn.oracle.com/ols/course/50662/80642

*** Performance Best Practices for Oracle E-Business Suite on Oracle Cloud Infrastructure and On-Premises (MOS Note 2528000.1)

Best support article to show all EBS Perf related info

https://techgoeasy.com/step-step-upgrade-steps-r12-2/

https://techgoeasy.com/oracle-tutorials/oracle-performance-tuning/

https://techgoeasy.com/downloads/