All vessels need to be buoyant in order to float, and need to be stable in order to stay upright.
 
This revised edition of RYA Stability and Buoyancy (which includes a glossary of terms, explaining all the technical jargon) deals with everything relating to these issues and also includes hazards common to most boats, including:
 
Bad loading
Breaking waves
Resonant rolling
Broaching in a following sea