Have you always wondered why you like one design and dislike another? Why do some products/services with a certain design prompt you to take action, while others do not? Our book will tell, show, and explain why all this happens. The basics of UX and UI design that we will explore will help you understand how to create a design/interface that grabs users' attention and encourages them to do what you need. We will examine the fundamental principles of design - from choosing the font or color of the created interface to the proper use of proportions and space. Analyzing and dissecting the success of designs from global brands (Google, Yandex, Ebay, Tesla, Facebook, Aliexpress, Apple, Samsung, Microsoft, Amazon, Spotify, Instagram, CNN, BBC, Netflix, Binance, Duolingo, Tiffany, Bang & Olufsen, McDonald's, Trello, Adidas, PayPal, and many others) will help in understanding how to correctly use perception psychology and patterns to attract customers and create a product.