In Drupal 8, .info file is converted to .info.yml file. It is a symphony component. The .info.yml file contains the metadata about your theme, such as theme name, description, version of the Drupal it supports, and type. Type is new metadata type indicate type of the extension such as module, theme etc.
Theme Migration
A landing page refers to a particular web page that a visitor usually reaches upon clicking a link or an online advertisement. This page usually displays information that is directly related to the keywords that has a user has searched for, or the has the relevant keywords directly on the page. Landing pages are basically conversion tools i.e. the primary objective of a landing page is to turn a visitor into a lead.