[Zope] Creating a ZCatalog to catalog the newly created objects using ZClasses

Hello, I was reading and following the zope book to Creating a ZCatalog to catalog the newly created objects using ZClasses while this message was displayed. "ZClasses are a deprecated feature and should no longer be used for new projects. Instead use either through-the-web scripting with Zope Page Templates, PythonScripts etc. or write a Zope product." Please can somebody point me to "How to" for any of these new recommended ways. Thanks.