A task type is a way to categorize your tasks. It helps you to keep an overview about your different tasks and to evaluate them later on. Before you can create your first task, you have to add a task type.
You can create a new task type by going to menu / Settings / Task Workflows
Here you will have the possibility to create a new type by clicking on the "+ Add Type" button. Then it will open a new pop-up where you can name the type and set the workflow.