I am going through lessons first time round (currently at expert level 7) just to gain an overview and grasp it conceptually before re-watching them to get into each lesson more. Could you offer any guidance on navigating your site where it covers the subject of immutability where records cannot be overwritten and archiving of historical records (either by keeping records in original table along with their updated version or in a seperate archive table that you append records to) - i assume there are many ways - are there any that dont require loads of sql/vba?