How To Use Signals In Godot

Описание: Hello everybody, today used signals in Godot which as always you can find on my discord at the about section.
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Code:
extends Control

signal start(num:int)

func _ready():
$Button.button_up.connect(button_up)
$Button.button_up.disconnect(_on_button_button_up)
start.emit(2)

func _on_button_button_down():
print("down")

func button_up():
print("up1")

func _on_start(num: int):
print(num)

func _on_button_button_up():
print("up2")