Hi Aparna, hope you are meaning about the programming languages and I would tell in that point of view. The basic or like the abcd of english, is the C programming in Computer languages. It is the still the okdest language and still very much in use in many companies. Though the language migration is happening, the power of C is still there in many applications. Once if you master C language, then there would be no issues, learning java, python etc. Where there would be just syntax changes. With respect to developing websites, HTML is the base language from which you can develop many websites along with which you would require javascript, css and bootstrap languages for development of websites to better outlook.