Ship combat is more detailed than personal combat but is still reasonably simple. Worlds and Adventures details world creation as well as encounters both intelligent and animal. This book then moves on to equipment usefull for adventuring in the outback of the backwater planets that crop up in every subsector of the Imperium. On to Encounters which details, well, meeting things. Players often spend lots of time looking for patrons.
Patrons are story hooks as well as employers and are a frequent starting point for an adventure.
Random person encounters are just that people you run into when doing something else. These could of course turn into excuses for slinging the hot lead though the local law might have something to say about that. More interesting is the section on animal encounters. What your given is rules for the random generation of entire eco-systems worth of animals. Different planet characteristics and terrain types modify the size and capabilities of critters encountered.