I am new to DTM and adobe analytics. I took some trainings about DTM and Adobe analytics. I am still feel pretty confuse about "could I re-use the variables". For example if I decided to assign eVar1 = productID in a property, could I use eVar1 for something else in other property?
Is eVar/ prop unique in a property or report suite? If so, what's the best way to track which eVar/prop have been used for what?
Also for all the eVars or Props, is there guidance which variables should use for which kind of event/ values?
You can reuse variables but not in the way you are thinking. Setup Data Elements within DTM to do this.
You can have a Data Element named "ProductID". Then within analytics you set eVar1 (or whatever variable) to %ProductID% and then you can use that Data Element for any other var or tool or tag that you are using DTM to deploy.