Strong AI is able to learn like a human. That means that strong AI able to learn any kind of information and be able to apply this information in any related situation.
Strong AI can solve problems of any type (like human do). That means strong AIís decision making process is not limited by any specific field.
Strong AI is able to experiment.
Strong AI is able to learn from society, for instance by reading.
Weak AI is not universal problem solver:
Know how to build strong AI.