Every website and especially web applications need a good favicon bundle to be ready for prime time. The easiest way to accomplish this would be to copy the favicon code from the default-theme package into your own package. For a step-by-step instruction, see here.
Every attempt has been made to cover much of what the most common customizations that developers want to do but of course this doesn't even scratch the surface of what developers want to do with an ecommerce system. We are always open to suggestions of more topics that should be covered here, but these are driven by the questions we consistenty get asked in our support chat and on our forums.
If you want to get even further into Reaction Commerce there are some additional tutorials that cover specific topics.
Scenario 1: Payment Provider Plugin
The first is for if you want to add a specific payment provider that we do not currently support: Creating a Payment Provider Plugin
Scenario 2: Extending the Product Schema
Here we are going to extend the schema of our products to accommodate two additional fields: Longitude and Latitude. We want to use the fields to sell products or services that are bound to specific locations. For example, we might sell certain products only in specific branch stores and we'd like to give the user a map to see in which stores our products are available: Extending a product schema and display geographic location of product in Google map
Scenario 3: Testing
Another scenario is an in-depth tutorial into how to write tests in Reaction Commerce and how to overcome some of the common challenges with testing: Testing Tutorial