A template is used for a quick entry of repetitive records. When you use the template, the pre-completed record is shown. Then just save it.
How to create or view the template?
1/ You can create the new template or view the first three templates from your list by tapping on the FAB button (+) on Dashboard or Overview.
2/ When you edit a record, there is also the template button on the screen. You can select or add the template or go over to templates' settings. (The template sidebar is also shown if you slide left the edge of the screen).
3/ Settings > Templates