Study the information about prepositions and adjectives.
There are no rules, you should remember these phrases:
Afraid of
Angry with somebody
Angry about something
Different from
Fed up with
Full of
Good at/ bad at
Interested in
Married to
Sorry about something
Sorry for doing something
Nice/kind of somebody to
Be Nice/kind to somebody

They are interested in sport.

The shop was full of people.

He is sorry about this situation.