CSHARP

basic movement script unity

public float speed = 5;

void Update() {
    float x = Input.GetAxisRaw("Horizontal");
    float y = Input.GetAxisRaw("Vertical");     
    gameObject.transform.Translate(new Vector3(x,y,0) * speed * Time.deltaTime);
}

unity 3d movement script

//make sure to add a CharacterController to the thing that you want to move

using UnityEngine;

public class PlayerMovement : MonoBehaviour

{

    CharacterController characterController;

    public float jumpSpeed = 8.0f;

    public float gravity = 20.0f;

    public float speed = 9.0f;

    private Vector3 moveDirection = Vector3.zero;

    private void Start()

    {

        characterController = GetComponent<CharacterController>();

    }

    void Update()

    {

        var horizontal = Input.GetAxis("Horizontal");

        var vertical = Input.GetAxis("Vertical");

        transform.Translate(new Vector3(horizontal, 0, vertical) * (speed * Time.deltaTime));

        if (characterController.isGrounded)

        {

            moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0.0f, Input.GetAxis("Vertical"));

            moveDirection *= speed;

            if (Input.GetButton("Jump"))

            {

                moveDirection.y = jumpSpeed;

            }

        }

        moveDirection.y -= gravity * Time.deltaTime;

        characterController.Move(moveDirection * Time.deltaTime);

    }

}