GitHub - alexa-samples/skill-sample-nodejs-decision-tree: An Alexa Skill Sample that progresses through a series of questions and then provides a career suggestion. Demonstrates an 'expert system' approach as opposed to a 'branching tree' approach.
Alexa Python Development: Build and Deploy an Alexa Skill – Real Python
New Alexa Skills Training Course: How to Build a Multimodal Skill : Alexa Blogs
How to Build Your First Amazon Alexa Skill - SitePoint
How To Build Alexa skill on Alexa Developer Console - DEV Community