Ключевые слова: advice, book, booklet, brochure, closed, color, colored, concept, contents, cover, data, design, document, education, expertise, flat, guidance, guide, guidebook, handbook, help, icon, illustration, information, instruction, instructions, leading, learn, manual, manuals, read, reference, service, support, technology, textbook, training, tutor, tutorial, use, user, users,