Ключевые слова: academy, book, business, certificate, class, collection, communication, computer, cost, course, design, digital, diploma, distance, education, flat, graduation, icon, illustration, isolated, knowledge, laptop, learn, learning, library, line, online, outline, people, platform, school, seminar, set, simple, stroke, student, study, symbol, teacher, teaching, technology, test, thin, training, university, video, web, webinar, website,