Understanding fluid mechanics (hydromechanics) is essential in engineering and environmental sciences. The most important concepts are presented in an unconventional way in this book, featuring cartoons by Oliver Romberg, co-author of "No Panic about Mechanics!", along with Wozu pages and skull chapters. For students, it is not a workbook or a textbook, but a learning book. For professionals in the field, it is systematically organized for refreshing and referencing quick calculations – all solvable with pencil and paper. The focus is on example problems, not hundreds, but 55, and they are detailed, not just providing final results. The minimum necessary theory for understanding a topic is explained in simple terms as a guiding thread, never exceeding four pages at a time. It starts at a school level and covers topics up to the level of specialized studies.