How to prevent the character from moving outside the camera?

Question

Unity

using UnityEngine;

public class PlayerControll : MonoBehaviour
{

    public float horizontalSpeed;
    public float speedX;
    public void MoveLeft()
    {
        speedX = -horizontalSpeed;
    }

    public void MoveRight()
    {
        speedX = horizontalSpeed;
    }
    public void MoveStop()
    {
        speedX = 0;
    }
    void FixedUpdate()
    {
        transform.Translate(speedX, 0, 0);
    }
}

Borders

Answer 1

If he touches one of the barriers with the borders (extreme points), forbid him to move. Every time a player moves to the right or left, check if he has gone out of bounds, if he starts to go out, then prohibit movement in that direction.

Answer 2

If the object crosses the border positions, return the character to the border position.