How do I make enemies shoot at me on sight??

I am making a game and I need the enemies to shoot at me right as they see me. It would be preferable if they shot at me again as they see me again. Also, if it is not hard, I would like to know how do you make them walk toward the player if the player gets out of sight.

Thank you

In a very general sense:

Have your enemies raycast toward the player.

If the player is hit with the raycast, store the x,y location of the player in that enemy's instance variables and shoot.

If the raycast then misses the player, have them move toward the x,y location and raycast again.

If that raycast misses, you can have them start wandering around and searching or return to their original location.

Ok, this might sound a bit like a noon question, but what is a ray cast?

construct.net/en/make-games/manuals/construct-3/behavior-reference/line-of-sight