What do I need in to start off building a web application in edge, specifically that only need to work in the sidebar. If you can give me some terms to google that points me in the right direction, it would be really appreciated. I'm looking to create something similar to sticky notes, that only works in the sidebar.
Tried googling but none of the results matched what I am looking for
I see that Avilon has provided you with a link to the "Creating Extension Tutorial". You can also refer to the following link:
1.Extension concepts and architecture: https://learn.microsoft.com/en-us/microsoft-edge/extensions-chromium/getting-started/
2.Extensions in the Microsoft Edge sidebar：https://learn.microsoft.com/en-us/microsoft-edge/extensions-chromium/developer-guide/sidebar
3.Supported APIs for Microsoft Edge extensions：https://learn.microsoft.com/en-us/microsoft-edge/extensions-chromium/developer-guide/api-support