About gmail “+” trick - in real life scenario there most likely there would be a designated email address only for invoices (for example invoices@my-company.com).
But since we are using our own email addresses for the sake of exercise we need to find a way on how to work with them. One of the ways is by using gmail “+” trick (read more about it here ).
In the exercise we will use your email address but with the + added, so if your email is littlebunny@gmail.com we are going to use littlebunny+workshop@gmail.com