JavaScript and event-driven programming for user interaction
Good web application architectures - MVC and SPA
How to submit data to the server? The form element, the get and post methods
How to use server-side script languages? PHP, JavaScript
How to use databases? MySQL, MongoDB, local storages
How to use/develope JavaScript frameworks? jQuery, Bootstrap, AngularJS, T3PO
Many other new advanced technologies are ... iframe, Server Sent Event, Ajax, JSON, cookies, session management, localStorage, web server, WebSocket, web service, other HTML5 features, ...
How to support sensors such as GPS
How to support Bluetooth
How to use local DBs
How to use local devices, such as microphone
Eventually, web programming on mobile devices, such as cell phones and tablets
Can you try Memo on your cell phone?
Isn't it a mobile app?