Tables that extend a table inherit the parent's fields. Extending a table means creating a child table that shares the same columns and business logic as the parent table. For example, the Incident table extends the Task table, which means that all fields defined on the Task table are also available on the Incident table. Extending a table allows for reusing existing fields and behaviors without duplicating them on multiple tables. Reference: Table extension and classes

https://developer.servicenow.com/dev.do#!/learn/learning-plans/rome/new_to_servicenow/app_store_learnv2_scripting_rome_debugging_client_scripts

Application developers can specify which ServiceNow page a user sees after submitting a new record using the Record Producer UI by writing a script in the Record Producer's Script field: producer.redirect = "<URL>";. This script sets the redirect property of the producer object to the URL of the desired page. For example, producer.redirect = "home.do"; will redirect the user to the homepage after submitting the record. The other options are not valid ways to specify the redirect page for a Record Producer. Reference: Populate record producer data and redirect users

See list of triggers on right hand side of this
webpage:https://docs.servicenow.com/en-US/bundle/tokyo-application-development/page/administer/flow-desig The trigger types in Flow Designer are Application, Record, Schedule, and Topic. Outbound Email is not a trigger type, but an action type that can be used in a flow to send an email message1. References: Flow Designer Trigger Types