I am starting a list of Revit Etiquette Do's and Don't for users and consultants and am looking for items to add. Things like
Don't
Edit a type that someone else created and is using without the express permission of its creator/current user.
Do
Duplicate and rename a type before making changes unless the existing type is actually changing. Notify others/document the new type/change to existing type.
Do
Be aware of what workset you place items on and verify that the workset is the correct one for the component you are placing.