function readOnly(count){ }
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This is where you can put conditional rules on a field so a certain field is required if another is over 30... which is literally a classic example!
https://help.salesforce.com/articleView?id=fields_about_field_validation.htm&type=5
https://trailhead.salesforce.com/en/modules/point_click_business_logic/units/validation_rules
Easy peasy, you'll crack it in no time!