SQL (Structured Query Language): 

SQL is a special purpose programming language designed for managing data that has been held in a Relational Database Management System (RDBMS). As big data is a great concern of companies, they are investing on database management or warehousing. In this trending data management market the need of an SQL candidate has been skyrocketed. Stack Overflow survey reported an average salary of $91,431 for a SQL developer. A candidate can also look for other related jobs in SQL—SQL Database Manager, and SQL Analyst.

JavaScript:

JavaScript is one of the three core technologies of World Wide Web. It is a programming language standardized with ECMAScript language specification. The 2016 Stack Overflow survey reached out 4 percent of the 15 million developers worldwide; they cited that majority of the developers use JavaScript as their programming language. There are plenty of developers who do full-time and freelancing JavaScript programming. So make sure you get this language in your list to earn an extra dime sitting at home. 

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