Hello @One07k-4914 ,
Thank you for taking time to post this issue in Microsoft Q&A forum.
Actually, I’m not sure if you want to create a Visual Studio(VS) Extension or a Team Foundation Server(TFS) Extension.
For VS Extensions, these things can be extended: menus, toolbars, commands, windows, solutions, projects, editors, IntelliSense, and so on(any parts of Visual Studio). If you want to create a VS Extension, you can refer to this document: Staring to Develop Visual Studio Extensions, which I believe, you have read.
For TFS Extension, these things can be extended: new web experiences, dashboard widgets, build tasks, and so on. Normally, they are developed by using HTML, JavaScript, and CSS. If you want to create a TFS Extension, you should refer to this document: Develop a web extension (Here are more explanations about TFS Extensions). And actually, the created TFS Extension is needed to be packaged and published to the Visual Studio Marketplace and be installed into an organization.
Best Regards,
Tianyu
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