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How do i make my player move with a moving platform in unity 2d

I'm making a 2D platformer and decided to add sticky platforms. I've made the platforms move, but the player doesn't move with them.
However, after parenting the player to the platform, the player still falls through. I have added two BoxCollider2Ds and set one of them as a Trigger. None of the colliders have a RigidBody2D
public class StickyPlatform : MonoBehaviour
{
private void OnTriggerEnter2D(Collider2D collision)
{
if (collision.gameObject.name == "Player")
collision.gameObject.transform.SetParent(transform);
}
private void OnTriggerExit2D(Collider2D collision)
{
if (collision.gameObject.name == "Player")
collision.gameObject.transform.SetParent(null);
}
}

trigger does not stop object move through the box, you can try OnCollisionEnter.
Usually I would have a ground check and you can say if(isGrounded&&onPlatform) //move with platform

So it sounds you have two problems:
Player is falling through platform
Player isn't sticking to the platform
Falling through the floor is a super common bug, with many causes. Here is a checklist I found:
does Object have a Collider? If not, select Object
go to the top bar
components
physics
choose appropriate collider
(if Terrain, check the last tab, the little cog-wheel)
Note: mesh-collider may cause problems
Particularly, if both FallingObject and GroundObject have mesh-collider
Particularly, if the mesh is animated
To avoid mesh-collider, you can build an aproximate shape of your mesh from
several primitive colliders (in parent-, child- or sibling-GameObjects)
If you need a Mesh-collider no matter what, you can try to place additional primitive colliders where they won't be in the way to 'enforce' the collisions
Is the Object a Trigger? If so, select Object
find its Collider-Component (if Terrain, check the last tab, the little cog-wheel)
remove the check of 'IsTrigger'
Is the Collider placed well?
Fiddle with center, size and skin-width (start with 0.1) until the green outline aproximately fits the character
(If you get really strange values, it might be due to scale (e.g. your mesh was way too big so you downsized to .01))
You may try to zero out all positioning (both unity and your modeling-program)
The link goes into even more cases.
Once the player can stay on, the physics engine should handle the momentum transfer to move the player with the platform using friction. Which again, requires RigidBody2D. I'm not sure why you're not using RigidBodys, it kind of feels like you're avoiding the solution.
Doing it this way should avoid the need to parent the player, and have a trigger volume as well, unless you want the player physically stuck and can't move on the platform.

Distance between game object and ground in Unity

I recently started having a look at game development with Unity and was trying to make a simple 2D character with basic movement abilities. This character is supposed to jump and move from side to side, but only if it is standing on something.
Now my question is: How do you check if a player is standing on something? / Get the distance to the next game object / collider beneath the player game object?
Would greatly apreciate any helpful answers and especially explanations on how exactly it works. Thanks!

To do this, you need to send a ray to detect the point of impact on the ground and then calculate the distance. The code below sends a ray from the center of your object down to the maximum height (3) and gives the size.
public LayerMask groundLayer;
public float maxRayLength = 3;
public void Update()
{
var hit = Physics2D.Raycast(transform.position, Vector3.down, maxRayLength, groundLayer.value);
if (hit) Debug.Log(hit.distance); // it will print current distance from pivot
}
If you want to calculate the height of the ray from the character's foot, there are two methods, one is subtracting half the height of the character from it.
Physics2D.Raycast(transform.position-transform.up*height, ....)
Next one is to use an empty object at the base of the character, which we refer to instead of the center.
public Transform pivot;
Then..
Physics2D.Raycast(pivot, ....)

There are a few ways of actually doing this.
The most usual although a bit complicated way of doing it for a beginner is using Raycasts. A Raycast is basically a small invisible line that starts and ends where you tell it to. If anything of a specific tag or layer is caught in it's crossfire you can basically pull that object from your code. Raycasts are used for a lot of things, most notably in Shooter games to shoot or in games like Skyrim to pickup objects and interact with them.
Another way to do this, which is a bit more popular in 2D games is to create a "feet" GameObject and make it the child of the player in the hierarchy. You can add a box collider on that GameObject and check the "IsTrigger". You can add a Tag to your ground objects and through your code using the OnTriggerEnter() and OnTriggerExit() Methods you can basically tell when your character is floating on air and when he is on ground.
Another popular method is to use the Physics.OverlapBox() Method which is pretty much the same as the Trigger Method but you are creating an invisible box (much like a raycast) and instead of only getting notified when Triggered (something enters or exits) you check if the invisible box is colliding with another object/tag/collider (which could be your ground).
There are also a few different things you can do with a Nav Mesh (mostly in 3D) but I think that for now these 3 should suffice!

Networked AR Unity can't make a bullet a child of the ground plane stage

I am trying to make an AR game and am currently using Unity's high-level networking classes. I have set my player prefab to be spawned in one of the two network spawn locations, which are both childs of the Ground Plane Stage. When user has tapped to make their ground plane stage and has tapped to be the host, their player character appears. Unfortunately, if they press the fire button, the bullets appear above the stage and unscaled, meaning they aren't parented to the stage. This confuses me because I've checked many times and the bullet emitter is a child of the player, and in my code it references said emitter. Thus I'm rather confused why the bullets don't seem parented.
I've attempted to attach a script to make the bullet emitter a child of the player when it spawns. I've also tried making it a child of the stage when it spawns. I've tried making the player character not dependent on the Network manager spawning it when the player joins, but then that leads to other networking problems when it comes to controlling the character, but it can shoot then.
The only one that was relatively successful was making the bullet a child of the stage when it spawned, but it would only stay in one place. Attempting to make the bullet a child of the player did nothing
//This is the class I'm trying to use to make the object a child of
something
public class AddToBeetle : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
GameObject player =
GameObject.FindGameObjectWithTag("Player");
transform.SetParent(beetle.transform, false);
}
}
It rarely prints any error messages. I hope that I can eventually get the bullet to spawn in front of the player model when the button is pressed.

Oh gosh I was dumb, the one thing I didn't apply the script to was the player's bullet emitter. It was super late and that's probably why I missed trying it on that. Anyway I hope this helps someone else if they ever have to deal with AR and Unity.

Unity Transferring a Game Object to another scene

I have a CharacterSetUp.cs that creates a character from choices the player has made.
I am making a game and will turn it into a multiplayer game so I would rather not call this script for every scene changed. I cannot turn the player into a prefab because Editior.prefabeCreate cannot be used in a build.
I would like to call this script once (when player starts game)
Then When the player changes scenes I would like to take that (player-Game Object)
So it can be used and then spawned onto a empty spawn point
I know how to do the (First Bullet Point)
How would I go about transferring a Game Object to another scene? (Second Bullet Point)
Once that is done putting it on a spawn point is simple (Third Bullet Point)

Very strange trigger behavior in Unity2D (4.5)

I am developing 2d platformer and I've faced with a very strange triggers behaviour in Unity. I have made the enemy that can throw objects into main player. So I have made two empty GameObjects with Circle2D colliders on them and attached them into the enemy GameObject. The first trigger ensures that when enemy hand will pass through it, it will spawn an object that will be thrown in future, and the second trigger is responsible for the throw that object into player. The first trigger ensures that when the enemy's hand will pass through it, it will spawn an object that will be thrown in future, and the second trigger is responsible for throwing an object into main player. Every trigger has a Rigidbody2D component attached to it. The hands of the enemy have tags "right hand" and "left hand" and I am checking the in the OnTriggerEnter2D method. This method is calling and I have log messages and this method is detecting that left or right hand are entering trigger. But the problem is in that this method is calling when the hand has already passed through trigger and get out of its bounds. Can anyone help me and explain why this is happening? I have attached a picture where I draw a scheme and described my problem.