Hi, you can use
body_entered(body). In body you can use the parameter to check if the body who entered the area is lasershot. For example, you can define a function in lasershot that does nothing, but you can use to identify a lasershot:
#this goes in lasershot
Then in your enemy, you check if body has that method:
#don't forget to connect the body_entered signal with this function
#here you put whatever you wanna do when laser shots hits enemy.
Perhaps there is a better way, but i usually do this. You can also set collission masks/layers to set enemy only can be collided by lasershot. For example, you put lasershot in layer 2, and you only enable second bit on mask of enemy, or something like that.