P6 EPPM on Oracle Docs (good to find any part of P6 EPPM)
https://docs.oracle.com/cd/F37125_01/index.htm
P6 Pro on Oracle Docs
https://docs.oracle.com/cd/F37128_01/index.htm
How do I use P6 EPPM (user guide)?
https://docs.oracle.com/cd/F37125_01/English/User_Guides/p6_eppm_user/index.htm
How do I use P6 Pro (user guide)?
https://docs.oracle.com/cd/F37128_01/English/User_Guides/p6_pro_user/index.htm