Question

A _____ website structure is appropriate if visitors should view the webpages in a specific order, as in the case of training material in which users need to complete training module 1 before attempting training module 2.​

Answer 1

The design of the navigation within the website determines the type of the structure of the website. Linear website structure has linear  navigation, which means that each page is simply linked to the one before.
A linear website structure is appropriate if visitors should view the webpages in a specific order. The case in which the users need to complete training module 1 before attempting training module 2 is example of linear website.