How can we learn Primavera online?

There are many training available online. Same time there is manual available online. You can learn from both.

https://www.planacademy.com/primavera-p6-training/

This is one link. Try this

you can learned primavera online knowing to make

1. Project Name

2. Proect ID

3. EPS

4. OBS

5. WBS

6. Resources