The is a potent resource—one that separates students who memorize from students who understand. When used ethically, it provides:

Many engineering concepts are best learned through worked examples. While the Fish textbook provides examples within the chapters, the end-of-chapter problems often introduce new variations of the material. The solution manual effectively expands the library of worked examples, giving students more data points from which to learn.

However, (odd-numbered problems, selected chapters) are sometimes provided legally with the textbook or on the companion website.

: Cover the solution with a sheet of paper, reveal one line at a time, and ask "What would I do next?"