Depending on your enemy, there are a few ways you can do this. I will offer you examples using 2D, as you didn't specify if the game was 2D or 3D.
These are 2D enemy chasing player scripts.
Add this function to func _process(delta).
full top-down game:
func hostile(time):
target = get_node("../Player")
#if target:
velocity = global_position.direction_to(target.global_position)
#position of player minus enemy position will give us direction
dir = target.position - position
#get angle from direction (Note roation is in radians)
get_node("Sprite").rotation = dir.angle()
move_and_slide(velocity * SPEED * time)
Another version of top-down can be found here.
https://kidscancode.org/godot_recipes/ai/chase/
A platform enemy is a little different. KidsCanCode has this code for collision detection on a platform for an enemy:
func _physics_process(delta):
velocity.y += gravity * delta
if not $RayRight.is_colliding():
dir = -1
if not $RayLeft.is_colliding():
dir = 1
velocity.x = dir * speed
$AnimatedSprite.flip_h = velocity.x > 0
velocity = move_and_slide(velocity, Vector2.UP)
This code can easily be manipulated. If the player in in the enemy line of sight, have the velocity.x flip direction, and the sprite(s) to flip.
