Ask HN: How can I learn to create an iOS application over the summer?

I am a 14 year old living in St. Louis, MO. I will be entering high school when this summer is over. I really want to create some kind of application so I figured iOS would be the best option but I am willing to try to create a web app or desktop app if that could be easier to learn.

Keeping in mind that I have no money and can't drive anywhere, what is the best free option for me to learn how to program and create an actual working application.

The public high school I am going to attend to will have some CS courses that I can take ( I think using BASIC ) but I would like to create some kind "real" of application over the summer.

What is the best language for me to learn ( iOS - Objective-C, Website - HTML/CSS/JS, etc )?