Мимокрокодил

public IEnumerator GetRemoteTexture(string url, Action<Texture2D> response) {
	UnityWebRequest request = UnityWebRequestTexture.GetTexture(url);
	yield return request.SendWebRequest();
	if (request.result != UnityWebRequest.Result.Success){
		response(null);
	} else {
		response(DownloadHandlerTexture.GetContent(request));
	}
}

// ...
using System.Collections.Concurrent;
// ...
private readonly ConcurrentQueue<Action> _Actions = new ConcurrentQueue<Action>();
// ...
// Когда вам нужно что-то запустить из другого потока, вызываете тут
_Actions.Enqueue(() => {
	// Ваш код
});
// ...
private void Update() {
	while (_Actions.Count > 0)
		if (_Actions.TryDequeue(out var action))
			action?.Invoke();
// ...
}

using UnityEngine;

public class SimpleTrigger : MonoBehaviour {

	public GameObject button;

	private void OnTriggerEnter2D(Collider2D c) {
		if (c.gameObject.tag == "Player")
			button.SetActive(true);
	}
}

if (Physics.Raycast(transform.position, _direction, out hit, 10f)) {
	if (hit.collider == yourCollider) {
		// some logic
	}
}

private MyComponent GetTarget() {
	if (Physics.Raycast(transform.position, _direction, out hit, 10f))
		if (hit.transform.TryGetComponent(out MyComponent m))
			return m;
	return null;
}

using UnityEngine;

public class PlatformMove : MonoBehaviour {

	// movement

	private void OnCollisionEnter2D(Collision2D c) {
		if (c.gameObject.tag == "Player")
			c.transform.parent = transform;
	}

	private void OnCollisionExit2D(Collision2D c) {
		if (c.gameObject.tag == "Player")
			c.transform.parent = null;
	}
}

// imageTitle - имя файла, например, time stamp
string pathToFile = Application.persistentDataPath + "/" + imageTitle + ".png";

using System.IO;

// ...

public bool SavePNG(Texture2D texture, string pathToFile) {
	if (!File.Exists(pathToFile)) {
		byte[] bytes = texture.EncodeToPNG();
		File.WriteAllBytes(pathToFile, bytes);
		return true;
	}
	return false;
}

public static Texture2D LoadPNG(string pathToFile) {
	Texture2D texture = null;
	if (File.Exists(pathToFile)) {
		byte[] fileData = File.ReadAllBytes(pathToFile);
		texture = new Texture2D(2, 2);
		texture.LoadImage(fileData);
	}
	return texture;
}

using UnityEngine;

public class MouseCenteringExample : MonoBehaviour {

	private void Start() {
		Cursor.lockState = CursorLockMode.Locked;
		Invoke("UnlockCursor", 0.05f);
	}

	private void UnlockCursor() => Cursor.lockState = CursorLockMode.None;	

}

using UnityEngine;

public class MouseCenteringExample : MonoBehaviour {

	private void Start() {
		var center = Screen.safeArea.center;
		Mouse.current.WarpCursorPosition(center);
		InputState.Change(Mouse.current.position, center);
	}

}

using System.Runtime.InteropServices;
using UnityEngine;

public class MouseCenteringExample : MonoBehaviour {

#if UNITY_STANDALONE_WIN

	[DllImport("user32.dll")]
	static extern bool SetCursorPos(int X, int Y);

	private void Start() {
		var center = Screen.safeArea.center;
		SetCursorPos((int)center.x, (int)center.y);
	}

#endif

}

using TMPro;
using UnityEditor;
using UnityEngine;

public class Calc : MonoBehaviour {

	[SerializeField] private TMP_InputField m_inputField;
	[SerializeField] private TextMeshProUGUI m_text;

	public void OnCalculate() {
        ExpressionEvaluator.Evaluate(m_inputField.text, out int result);
        m_text.text = result.ToString();
	}
}

// z is vertical axis (3d; y for 2d), x is horizontal axis
rigidBody.velocity = transform.forward * z + transform.right * x;