What should be used to create scratch orgs?

An Apex transaction inserts 100 Account records and 2,000 Contact records before encountering a DML exception when attempting to insert 500 Opportunity records.
The Account records are inserted by calling the database.insert() method with the allOrNone argument set to false. The Contact and Opportunity records are inserted using the standalone insert statement.
How many total records will be committed to the database in this transaction?

How should a developer prevent a recursive trigger?

What is the result of the debug statements in testMethod3 when you create test data using testSetup in below code?

Given the code below, what can be done so that recordCountcan be accessed by a test class, but not by a non-test class?