Replit offers users the ability to easily build and host Amazon Alexa Skills through a comprehensive tutorial that requires no physical Alexa device, utilizing a simulator and app instead. Users begin by configuring an Alexa skill in the Amazon Developer Console, cloning the "Replexa" template, defining their own intent, and testing the skill. The process involves creating an intent with specific utterances, hosting the skill in Replit instead of AWS Lambda, and handling requests through defined methods in the code. The guide details each step, including setting up the invocation, interaction model, and endpoint, and emphasizes the ease of testing the skill with an Alexa simulator. Additionally, Replit provides support through various contact methods to assist users in the skill-building process.