I am a Computer Science teacher in St. Patrick's Higher Secondary School, Asansol. I teach Java programming language, as this language is taught in ICSE/ISC schools. But my favourite programming languages are C, JavaScript, and PHP. I use Ubuntu OS on my laptop and desktop for day-to-day tasks. It is the best OS I've ever used. It is remarkably faster than Windows, prettier than Mac, and easiest to use than any other OS available. Above all, its free!