Answer : How many types of fruit have you tried ?
Where is 3 and 4? there are no questions
The insights that you can gain by studying psychology are the following:
Research - this helps the study become more productive in the needs of society, and at the same time discover various matters that involved it.
Perspective - with the study of behavioral science, you get to see a better perspective especially when encountering people.
Critical Thinking - it helps you gain more knowledge about your brain's activity, thus helping you develop more ideas in a better way.
Knowledge - in this world where people's minds have become the basis of society, you get to learn more about the world itself and how it develops.
-Do a complete background check
-Give them trails to complete
-make them fill out a form, and make them tell truth
These are the only things I could think of, hope this helps you ♥︎