Replacing RenderComponentField() calls in your templates
The RenderComponentField() method is deprecated (as of SDL Tridion 2013 SP1). If you continue to use the legacy template-based publishing model after upgrading to Tridion Sites 10, update your templates to instead call newer methods.
About this task
SDL Tridion 2013 SP1 HR1 deprecated the RenderComponentField() method at the same time it added the following methods:
FieldStartMarker()FieldEndMarker()FieldValueStartMarker()FieldValueEndMarker()
The newer methods make it possible to add, remove and move embedded fields in Experience Manager.