Hi IbrahimDgreat, welcome to the community
I think you should start by reading the documentation dan running some example tests, openmc has many examples provided here
Also, you can check each feature from openmc documentation, like this one for basic functionality
https://docs.openmc.org/en/latest/pythonapi/base.html
Or if you face some problem, you might check using keywords in this forum, since a similar problem might have been solved before through some discussion here.