Machines have become an inseparable part of human life. In today’s scenario we are surrounded by the innumerable gadgets saving lot of human energy: from giant industrial machineries to teeny-tiny chips into our wallets. Talking about computers, well they have made humans more organized and sorted in storing their important work. To get employed in the digital world one must have the basic computer Knowledge. The course on computer concepts also known as CCC is a Certificate course that is launched and designed by National Institute of electronic and information Technology (nielit) to impart the knowledge of the basic level in computer. The current edition of “course on computer concepts” is the study guide which has been prepared to give the complete coverage of the updated syllabus for those who are willing to learn the basic concepts. The book is divided into 9 chapters that especially include OS- Ubuntu and liberoffice, Chapter-wise multiple choice question and true/false questions are provided for the quick revision of every br>Chapter, latest computer abbreviations and Glossary is given that helps to gain confidence besides all these revision material, it also includes the 5 Practice Sets for the power pack preparation. Explained in a simple language that provides the ample knowledge course on computer concepts. Toc introduction to Computer, introduction to operating system, word processing (liberoffice writer), spreadsheet (liberoffice Calc), presentation (liberoffice impress), introduction to internet and www, e-mail, social networking and e governance services, digital financial tools and applications, overview of future skills and Cyber Security, computer abbreviations, glossary, (1-5) practice sets.