Ключевые слова: background, book, books, business, classes, communication, computer, concept, core, data, design, ebook, education, electronic, english, geography, history, home, information, internet, isolated, knowledge, laptop, learn, learning, library, math, modern, mouse, network, online, reading, red, research, school, science, service, startup, study, studying, teaching, technology, web, white, wisdom,