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SQL (Structured Query Language) is a standard database language that is used to create, maintain and retrieve relational databases. Started in the 1970s, SQL has become a very important tool in a data scientist's toolbox since it is critical in accessing, updating, inserting, manipulating and modifying data. NOTE : The uses and benefits of courses are given in introduction part only. All the best!
They each have their own purpose. Check em out yourself
HTML is the first tutorial to do for web development, then CSS for styling.
Learn Java or C# for enterprise development. Java is also helpful for Android development.
Python is a general purpose language but also popular for Data Science and Machine Learning which are also two more tutorials taught here.
Ruby also a general purpose language that can be used as a web back-end language along with the Rails network but it has lost its popularity over the years.