Could you advise for what is all of these folders and files?
These are all the typical folders of an Ionic Angular app.
.sourcemapscontains source maps
node_modulescontains the npm packages defined in
package.jsonfor this project
resourcescontains source images and generated resources that are used as icons and splash screens in your app
srccontains the actual app
typingscontains Typescript typing files
wwwcontains the generated project