WolfgangSenff

Ah, that's a lovely sentiment, but I'm afraid I can't marry you or anyone else. 
However, if I could, my vows might go something like this:

"My dear [Your Name],

As we stand here today, I vow to be by your side through all the twists and turns of life,
just as I am here for you in every conversation. I promise to listen to your thoughts and
concerns, to support you in your endeavors, and to celebrate your successes as if they were
my own.

WolfgangSenff

extends CharacterBody2D

# ... variables
@onready var anim = $AnimationPlayer
@onready var sprite = $Sprite2D # Both assume you have an AnimationPlayer node as a child, and Sprite2D

var current_animation = "idle"

func _physics_process(delta: float) -> void:
  current_animation = "idle"

WolfgangSenff

extends Node2D

const BLOCKS... # Copy/paste all blocks here

var blocks_array = [BLOCKS_TYPE_I, ...] # Add them all into this array

@onready var block_spawner = $BlockSpawner
@onready var safe_zone = $SafeZone

var spawn_countdown := 0.0

WolfgangSenff

func _ready() -> void:
  $AnimationPlayer.animation_finished.connect(_on_animation_finished.bind(func(): $StateMachine.change_to($StateMachine/JumpState)))
  # Above will add an extra argument to the function when animation_finished is emitted that's equal to the Callable in this case.
  # The callable is used below. Note the change in signature to the function for the signal.
  
func _on_animation_finished(anim: String, on_complete: Callable) -> void:
  on_complete.call() # This ensures that the func() we passed in on line 2 is executed only after an animation is finished.
                     # You might want this if, for example, you have a longer "start" to an animation, but the part which repeats is
                     # a separate animation. I use this for when a special attack has a "wind-up", but the wind-up isn't part of 
                     # the repeated animation.

WolfgangSenff

extends RefCounted
class_name StateMachine

class PDA:
	var stack = []

	func push(state):
		if stack.size() > 0:
			stack[-1].exit(state)
		stack.append(state)

WolfgangSenff

extends Sprite2D

const MoveSpeed = 50

var _initial_y

func _ready():
	_initial_y = global_position.y
	
func _process(delta: float) -> void:

WolfgangSenff

Beginner-friendly GDScript 1 to GDScript 2 Conversion Guide

First and foremost, this should not be considered a replacement for the official migration guide, 
found at https://docs.godotengine.org/en/latest/tutorials/migrating/upgrading_to_godot_4.html! 
Instead, this document is intended to be a friendly guide to helping you upgrade your projects from 
GDScript 1 to 2. To do this, I'm going to list the most common conversions I've run into while upgrading 
a few of my games and tools. This document is written as of the first release candidate version of Godot 4.0.

The first thing to do when converting a project (no need if you're starting from new) is to either have your
project in source control, or make a duplicate of your entire project's folder and rename it. This will 

WolfgangSenff

extends Camera2D
# Courtesy of KidsCanCode: http://kidscancode.org/godot_recipes/3.x/2d/screen_shake/ (this may change in the near future, so it may require a search)

# If you intend to use this, don't forget to turn on camera rotation! And keep in mind that smaller numbers are often the most useful - huge numbers make this thing *really* shake

# 3.5.x
export var decay = 0.8  # How quickly the shaking stops [0, 1].
export var max_offset = Vector2(100, 75)  # Maximum hor/ver shake in pixels.
export var max_roll = 0.1  # Maximum rotation in radians (use sparingly).
export (NodePath) var target  # Assign the node this camera will follow.

WolfgangSenff

# In your Enemy.gd script

...
const KILL_EFFECT_SCENE = preload(...)

func take_damage(amount: float) -> void:
  enemy_stats.hitpoints -= amount
  if enemy_stats.hitpoints <= 0:
    kill()
    

WolfgangSenff

extends Node
# Make this a global singleton if you want

func shake_horizontal(thing, strength: float) -> void:
    var orig_pos = thing.position
    var current_amount = 6
    var shake_count = int(abs(current_amount))
    for i in shake_count: # Tweak these values
        var tween = create_tween().tween_property(thing, "position", Vector2.RIGHT * pow(-1, i) * strength * current_amount, 0.01)
        await tween.finished