This is very good training on how to get started with an App Builder approach to application development. The material is well-covered and the exercises provide useful experience.
I'd like to see a deeper dive that discusses design details and internal thinking from the developers about intended approaches and patterns. Such information can be useful to inform architecture and design decisions when approaching a set of requirements. Consequences of a particular approach may not be apparent initially and we need to know what situations may not fit the App Builder model. Another approach might be to start collecting Tips and Tricks or Cookbook type documentation.
Thank you for your suggestion! The Low-code App Builder mission is designed and targeted towards all audiences covering the basics of application development in one day. As you continue your learning journey, we have content on architecture and design considerations that we cover in context to particular capabilities such as integration, data modeling, class structure, etc. You can learn about these in our later missions to include the system and senior system architect missions. The lead system architect training is primarily focused on architecture and design patterns.
Please do suggest any specific topics you feel would benefit from a deeper dive conversation that we do not currently cover.