Packages are a guaranteed set of lessons that you purchase from the teacher. Packages are good for both students and teachers for the following reasons:
Packages are designed so that you can schedule multiple lessons in advance. This makes it easier for students and saves them scheduling each lesson individually.
Most teachers offer a discount to students who purchase Packages. It's good for students because they can get a cheaper price, and it's also good for teachers who can get guaranteed lesson volume.
If you're not sure about buying a Package, then continue with scheduling individual lessons. Packages are offered as an option because many students and teachers want a way to purchase and schedule multiple lessons at once.
Packages are great when you've found a teacher that you really like and want to schedule multiple, on-going lessons with the teacher.