When communicating with developers, do you still communicate like this, "Please do it like this, swoosh~ tak." Of course, I'm also working as a UI designer, but... I'm frustrated because I feel like I'm the only one who can't do prototyping like everyone else... I really hate learning and doing code... This is a course on the Hi-Fi prototyping tool Principle for those who want to express a lot with a simple but high degree of freedom.