Which programming language should I learn first?

For the past year or two I’ve been really into developing websites and phone apps. However, I’ve never been able to because I don’t know how to code. I’m seriously considering going to school for web programming but before I make that step I want to teach myself as much as I can. I know there are a lot of different programming languages, html, java ect.

My question is what order I should learn the different languages. Assuming I want to know everything there is to know about development social networking sites and web applications and such.