Marcos Placona shares a detailed guide on creating an Alexa skill using Kotlin to help remember which bin color to use for waste collection, based on his local council's schedule. The process involves setting up a development environment with IntelliJ IDEA and Gradle, configuring an AWS Lambda function to host the skill, and implementing the skill's logic to determine bin colors based on the week number. After creating the necessary code and deploying it to AWS, the skill is connected to Alexa by configuring an interaction model and associating it with the Lambda function. Once set up, users can enable the skill on their Alexa app and test it with voice commands. Placona emphasizes the potential for further enhancements, such as integrating additional information or features, and invites feedback on improving smart device functionalities.