Can i use JavaScript to create apps?

Answer 1

Check out Unity, you can use Javascript. Unity supports 2d/3d games, on console, android or pc.

Answer 2

Yes! So Facebook makes a JavaScript extension that allows you to write apps with JavaScript, and have them compiled to both their native iOS and Android apps. It's free to use, and plugs into Android Studio which is also free.
Also there are some apps on Google Play that will let you make your own Android apps using HTML/CSS/JavaScript

Answer 3

yes, you can.

Answer 4

Yes you can with HTML, CSS, and JQuery (and JavaScript of course).