What courses should maintenance planner take in order to enhance his career?

You should start with 

- Project Management Professional - PMP

Then you can take couses such as CMMS, Maintenance Planning and Scheduling, Basics of reliability practices, RCM.  

SAP, Primavera and MS Project. Maintenance and Reliability professional certification will be an added advantage

first : maintenace corrective , conditional ,and systematique

maintenance management