This is very good tutorial to help you navigate the creation of satisfying Shiny applications. The author provides many example codes that demonstrates some of the key concepts.
This tutorial is a hands-on activity complement to a set of presentation slides for learning how to build Shiny apps.
The author describes step-by-step and interactively how to build a shiny application.
A shiny application that searches differentially expressed genes across multiple GEO (gene expression omnibus) data sets.
This article describes different layouts of shiny application.