I'm on the exercises in chapter 4 and am having issues with cleaning up the webroot.
18.Open File Explorer and navigate to your web root. In the Website folder, open the App_Config\Include folder. Delete the SitecoreDev folder.
19.Now, go to the bin directory in the Website folder and delete the SitecoreDev.Web.* files.
20.Finally, in the Website\Views\Shared folder, delete DefaultMVCLayout.cshtml.
If I delete the SitecoreDev.Web.* files, my Sitecore instance no longer runs.