Without any doubt, you should master Javascript (Frontend web development and Nodejs) and that will give you a firm grasp to learn actual frameworks and optional other dialects (CofeeScript, TypeScript, etc.). I recommend you the book "Javascript, The Good Parts" for start. Second, master Object Oriented Programming and C# and .Net. This will give you access to a robust framework that is growing far from its Windows source, reaching Linux and mobile development using Ximian Mono. Last, You should learn Java. You need this for Android Framework and for enterprise applications. This thing is huge, so diverse... If in .Net you have two or three ways of make something, in Java you will find 20 or 30 open source libraries for to do the same task. Not better or worse thant .Net, but the learning curve is huge. While you are learning those, you must study some flavor of SQL (those that you can download free like MySQL-MariaDB, PostgreSQL, Microsoft SQL Express, SQLLite, etc.). It is a must to know database CRUD operations. I am actually a some kind of programming languages observer. I have pleasure learning and compairing programming languages... but I am not alone. So, I can recommend you some hints of my method to learn as fast as posible a new programming languages: RECOMMENDATIONS: 1. Install Console2 and customize a tab for use with Node, Java, Grunt, etc. and any tool or language that supports some form of command line. I been using this with every new language that I want to learn, setting up - running batch files (.bat) that send me to the language command prompt. It is a pleasure to open a command window that is ready to test a new programming idea in any language. My actual Console2 configuration, give me fast access to the command line of nine languages (Python, NodeJs, Go, Erlang, Ruby, Clojure, Scala, Julia and Rust) and I expect it grows more... 2. Write down in Word, as succint as posible, looking for use just one or two pages: Primitives or Data Types supported (Enumerate all providing declaration samples), Control Statments, Exceptions control (if any), Input-Output details, Data Conversions, String manipulation and Date-Time manipulation. You will use this for fast checking and prevent lost time searching about it. 3. Write Code. Start with small programs with progressive level of complexity. Tipically, I wil