Really basic Unity camera script to follow the player object.

CameraFollow.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Simple camera follow system
public class CameraFollow : MonoBehaviour
{
    // The target to follow
    public Transform Target;
    // Position offset from target
    public Vector3 Offset;
    // How far to look ahead of the target
    public float LookAheadOffset;

    void Update()
    {
        var camCentre = Target.position + (Target.forward * LookAheadOffset);

        transform.position = camCentre + Offset;
        transform.LookAt(camCentre);
    }
}