The templates are what power the final code export. Each platform as its own template that can be edited as much as is desired.
There are two general categories of exports: components and files. Component exports are generally more complex and have more available props to work with. Also, with component props you can combine related assets into a single component (directional arrows for example, e.g.
File exports always have a 1:1 relationship with the assets being exported and are perhaps a little more straight-forward to understand.