The goal is for you to build a website and feel the same experience as the users who work on the platform everyday.
You should make notes as you go for reference later. These can be used to update documentation, tools or workflow and provide valuable information to our customer such as gotchas, exceptions and alternatives.
Building the mega site is a self-directed exercise and is intended for educational purposes during the Customer Success onboarding process. If you need more information or encounter an issue, approach the problem from the perspective of a Pantheon user as a way get more acclimated with the various services on the platform.
https://drupalize.me/videos/getting-started-pantheon?p=2286
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Build a Drupal 8 site on the platform.
If you’re already familiar with D8, try setting this up following the Build Tools guide: https://pantheon.io/docs/guides/build-tools/