This document discusses converting existing customizations built with JavaScript/jQuery to the SharePoint Framework (SPFx). It outlines the benefits of SPFx, including better manageability, deployment, and security. It then demonstrates the steps to convert a sample customization, including copying code, adding references, importing scripts, using properties, and deploying the solution. Some potential hurdles discussed are using REST APIs and disabling reactive property changes. The overall goal is to help clients modernize existing custom code to take advantage of SPFx.