Cecil Costa, also know as Eduardo Campos in Latin countries, is a Euro-Brazilian freelance developer who has been learning about computers since getting his first PC 286 in 1990. From then on, he kept learning about programming languages, computer architecture, and computer science theory. Learning is his passion as well as teaching; this is the reason why he worked as a trainer a books author. He has been giving on-site courses for companies such as Ericsson, Roche, TVE (a Spanish television channel), and lots of other companies. He is also the author of the book Swift Cookbook first edition, Swift 2 Blueprints and Reactive Swift Programming. Nowadays, Cecil Costa teaches through online platforms, helping people from every part of the world. In 2008, he founded his own company, Conglomo Limited (www.conglomo.es), which offers development and training programs both on site and online. Over his professional career, he has created projects by himself and also worked for different companies, from small to big ones, such as IBM, Qualcomm, Spanish Lottery, and DIA%. He develops a variety of computer languages (such as Swift, C++, Java, Objective-C, JavaScript, Python, and so on) in different environments (iOS, Android, Web, Mac OS X, Linux, Unity, and so on) because he thinks that a good developer needs to learn every kind of programming language to open his mind, and only then will he really know what development is. Nowadays, Cecil is based in the UK, where he is progressing in his professional career, working as an iOS Team Lead. I would like to thank mr George Boole for making everything true or false and to Leonard Kleinrock for creating the idea of internet.