Conditional loops are way to repeat something until a certain condition is met. If the condition is never met, the loop can become infinite. In Python conditional loops are defined with the while statement:

counter = 0
while counter < 10:
    print("in the loop")
    counter += 1

Use the while loop to move the turtle forward until it reaches the end of the window.

def move_to_window_border(distance):
    while turtle.xcor() + distance < turtle.window_width() / 2:
        turtle.forward(distance)

Can you make the turtle move exactly to the window border?

Loops can be interrupted with the break statement. This is often used in combination with infinite loops.

Write a while loop with a condition that is always True to draw a spiral. Interrupt the loop when the turtle reaches a certain distance from the center. Use the function turtle.distance(x, y) to get the turtle's distance to the point defined by the coordinates x and y.

def draw_spiral(radius):
    speed = 1
    while True:
        turtle.forward(speed)
        turtle.left(10)
        speed += 0.1
        if turtle.distance(0, 0) > radius:
            break