I have created a sample from the link you have given.
Step 1: Download the code into your local box.
Step 2: Update the connection string inside appsettings.json
Step 3: Please create 3 tables inside your database. Please refer to the "Scripts" folder.
Step 4: Execute the console application and see the data getting populated.
Please let me know if you need any assistance.
GitHub URL: https://github.com/vishipayyallore/mini-projects-2021/tree/master/Projects/EFPlusAuditDemo
appsettings.json file for reference
{
"ConnectionStrings": {
"SqlServerConnection": "Data Source=(localdb)\\LocalDbSessions;Initial Catalog=BooksStoreData;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
}
}

