What should I learn to build a kind of Social Network?

I'm a second year student in Higher Technical Certificate in Web Development in Spain and I have a project in mind, a kind of social network that I would like start developing slowly while I am learning so I can practice what I have learned and stay motivated.

Currently I have an intermediate knowledge of HTML / CSS and am now studying PHP and Javascript at school, but I wonder if there are other web development languages that may be more suitable for the development of social networks. I have read a lot about it, and some people recommend languages and frameworks like Ruby on Rails, Python Django, Laravel, Node.js, Scala ...

I would like to learn the language more suited to my project through Teamtreehouse because although my English is not very good yet I find it very easy to understand and is a very good way to learn English.

Some of the available languages in Teamtreehouse that I think may be suitable for my project are:

• Ruby on Rails   - Python & Django   - (PHP) Laravel   - Node.js (After learning javascript and other language like python or ruby ...)

  I also would like to get some advice on the following concepts about what would have to learn to make a serious web project.

• Other programming languages
• Security
• Databases
• Server administration
• ...

Thank you very much and long life to the Teamtreehouse community!