This is my first time trying to code a trigger in Salesforce. I have a checkbox labeled "Priority Contact," and I'd like the checkbox to be checked for all contacts that have at least one Opportunity or Meeting event linked to them. Could you please advise on how I should go about doing this? I'm also not 100% sure where to enter the code to activate the trigger. Thank you.

This is my first time trying to code a trigger in Salesforce. I have a checkbox labeled "Priority Contact," and I'd like the checkbox to be checked for all contacts that have at least one Opportunity or Meeting event linked to them. Could you please advise on how I should go about doing this? I'm also not 100% sure where to enter the code to activate the trigger. Thank you.