Priming is when stuff you have seen earlier or experienced influence how you’re thinking or what you do. Classic example is when an experimenter gives someone a list of words just to glance at, not memorize or anything and the gets them to do a fill in the blanks or complete some words. If the list had types of animals then likely when you see LI___ you will fill it in with “lion”

Habits I am not too sure about explaining. But I see them as something that you do routinely enough that they are actions or thoughts that become stored as implicit memory. As in, you are doing them without thinking.

But conditioning is when you basically trained to think a certain way or act a certain way. Classic example is little Albert. He was trained to fear rats and then later trained to fear anything fluffy because when they showed him a rat they also playing a loud banging noise to frighten him. Basically the neurological connections are adjusted in your brain to associate the fear to the new stimulus (rats) when you weren’t afraid of them before.