SharePoint 2013 supports two main ways of deploying new functionality - WSPs (Windows Solution Packages) and Apps. Apps are new, but WSPs are still good for many key scenarios. This video walks you through the more "SharePointy" topics, and introduces you to authoring WSPs in SharePoint. Having this knowledge is key to understanding Apps.
Sahil Malik has been a Microsoft MVP for the past 8 years, author of several books and numerous articles in both the .NET and SharePoint space, consultant and trainer who delivers talks at conferences internationally.