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Help me build a simple trigger to update an opportunity field from the User object

Hey Guys,


I have no idea where to start with this, and my contact at Salesforce said that this would be a great resource. I appologize for my niaveness with this, I am not looking for you to do my work, just point me in the right direction. Thanks!


English explination of what I'm looking to do:


There is a field stored on each user (assistant) the type is a Lookup Relationship to another user. I want that field to autopopulate in an opportunity field, Field_B. It should lookup the opportunity owner, grab the Assistant field and associate that user with the opportunity as Field_B.


Can anyone help me?





Here are some resources for learning Apex:


and some other tutorial resources:


and the general documentation area: