Hi Jasmine, 

Great question!

These words can sometimes be used interchangeably. There are slight differences, depending on the context.

Please see:

https://www.quora.com/Values-and-Principles-Is-there-a-difference-between-conduct-and-behaviour

Manjunath Sreedaran, works at Earth

Written 7 Aug 2014

"Conduct" implies a kept record or continual observation of a person, especially within an institution. Behavior seems to refer to immediate interactions.

You know, although both words are listed as synonyms, I tend to agree with this distinction:

Conduct 

As a noun, conduct can be used to describe job performance, especially in a negative sense. It relates to a standard of behavior:

unprofessional conduct

inappropriate conduct

Also:

The student got an "A" for conduct. Samantha won the Good Conduct Award.

Behavior

For example: Johnny's behavior was very bad yesterday.  

I'm watching your behavior!

Conduct can also refer to management:

The general's conduct of the campaign.

Do this explanation help you at all, Jasmine?

Dave

As other friends explained about the difference between these two words, the difference is that 'conduct' is stable and more general in comparison to 'behavior', while behavior is temporarily and is exposed to change or specific to a defined period of time.

example: He is a man of good conduct.

                Your behavior in the party was childish.

Dear Dave,

Kind thanks for a detailed and precise answer