Check out example codes for "movetowards unity". It will help you in understanding the concepts better.

Code Example 1

//This will work for 2d or 3d platforms
//Make sure to call in Update or else it wont work
Vector3.MoveTowards(transform.position, taretPos, Qiaternion.identiy)

Code Example 2

/// <summary>
/// Move 2D sprite towards target
/// </summary>
/// <param name="target"></param>
/// <param name="movementSpeed"></param>
private void Move(Vector3 target, float movementSpeed)
{
    //Move
    transform.position += (target - transform.position).normalized * movementSpeed * Time.deltaTime;
}

Code Example 3

//put this in update method and disable rigidbody2d (gravity)
void Update()
{
transform.position += (target - transform.position).normalized * movementSpeed * Time.deltaTime;
}

Code Example 4

using UnityEngine;// PlayerScript requires the GameObject to have a Rigidbody component
[RequireComponent(typeof(Rigidbody))]
public class PlayerScript : MonoBehaviour
{
    Rigidbody rb;    void Start()
    {
        rb = GetComponent<Rigidbody>();
    }    void FixedUpdate()
    {
        rb.AddForce(Vector3.up);
    }
}

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