Keep up with changes happening in Office add-ins and APIs

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Accepted Answer

There are a few ways that you can keep up with changes happening in Office add-ins and APIs
Blog: larger features and announcements - https://developer.microsoft.com/en-us/microsoft-365/blogs/technology/office-add-ins/
Community calls: information on what the Office teams are working on - https://docs.microsoft.com/en-us/office/dev/add-ins/overview/office-add-ins-community-call
Office.js reference: https://appsforoffice.microsoft.com/lib/1/hosted/office.js (see https://docs.microsoft.com/en-us/office/dev/add-ins/develop/referencing-the-javascript-api-for-office-library-from-its-cdn)