This recipe should help you discover all the aspecs of apps - so that you can use all the features available to you. 

Pre-Requisites

1. You have already worked with DNN and 2sxc as content-editor
2. You have host-permissions on the installation you're working on

Things to Learn

1. Working with views
   1. creating templates and Razor basics
   2. using url-parameters to automatically switch between views - so that /blog/ shows the list, but /blog/post/42 shows the details
2. Working with data
   1. create/modify content-types
   2. edit data entities
   3. using relationships between items
   4. exporting and importing tables of data
3. Working with visual query
   1. understand the concept, data-streams and data-sources (basic video)
   2. create / modify queries
   3. understand test-parameters for testing queries
   4. understand most of the data-sources like App, EntityFilter, AttributeFilter, Sorting, etc.
   5. understanding caching data sources
   6. how to use url-parameters in your query to filter / sort based an url parameters
   7. exporting / importing queries
4. App Management
   1. Setting app-name, folder, version etc.
   2. Exporting / Importing apps
5. Coding / Programming
   1. Razor Basics - see also the Razor Tutorial
   2. Using LINQ in your views for advanced sorting and filtering of data which may not be possible using the visual query