Digital electronics is called the core of modern technology. It operates on the digital signal which makes it less noisy and highly efficient than analog circuitry. For this, all the new and more attractive modern gadgets are built upon a digital electronics module. Also, digital circuitries are easy to program and implement according to user choices. I know there are many varieties of Electronics Books available in the market for one to gain the skills necessary to develop and construct your own functioning gadgets for both beginners and advanced learners. But the most popular one or the one that has the largest number of users in my country is Practical Electronics for Inventors, Fourth Edition for beginners and advanced learners by a noted Paul Scherz,Simon Monk. We all believe it is the widest used textbook in the world for this purpose.