We are now in the Object Oriented Concepts section of the course. In this introductory lesson, I offer an introduction to objects.
In this lesson, we discuss variables.
In this lesson, we discuss the use and types of variables in Apex.
Resource:
Variables - https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_variables.htm?search_text=variables