A bad PDF just gives you "12 m/s." A good manual shows you the formula, the area calculation, and the unit check. If you build this habit yourself, you won't need the manual.
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If you are stuck on an unsolved exercise at the end of a chapter, refer to the Solved Examples immediately preceding it; the book is structured so that the unsolved problems typically mirror the logic of the solved ones. A bad PDF just gives you "12 m/s
Educational resources like the Engineering Mechanics Solution Guide recommend using manuals as a learning tool rather than a shortcut. Students are encouraged to attempt problems independently before consulting solutions to identify specific areas of difficulty. Hydraulics, Fluid Mechanics and Hydraulic Machines Fluid Mechanics and Hydraulic Machines