Unity - Basic 3D/FPS Character and Camera Movement + Jumping - based on Brackeyes video: https://www.youtube.com/watch?v=_QajrabyTJc

readme.md

1. Create a new game object PlayerControllerFPS.
2. Create a empty game object child under PlayerControllerFPS called GroundCheck.
3. Drag the MainCamera under the PlayerControllerFPS. Reset the local positioning of the camera back to 0,0,0 if needed.
4. Attach the PlayerMovement script to the PlayerControllerFPS.
5. Drag the CharacterController into the properties of the PlayerMovement script.
6. Drag the GroundCheck over to the GroundCheck property.
7. Attach the MouseLook to the MainCamera.
8. Drag the PlayerControllerFPS from your scene onto the playerBody property.
9. You should have character movement and rotation!
10. Press escape to stop the camera movement. Ideally you can enable a debug menu based on this.

MouseLook.cs

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

public class MouseLook : MonoBehaviour
{
    private bool mouseLock = true;
    public float mouseSensitivity = 100f;

    public Transform playerBody;

    float xRotation = 0f;

    // Start is called before the first frame update
    void Start()
    {
        Cursor.lockState = CursorLockMode.Locked;
    }

    // Update is called once per frame
    void Update()
    {
        // Check if we disable lock state
        if(Input.GetButtonDown("Cancel"))
        {
            if(mouseLock == true)
            {
                Debug.Log("Unlocking cursor");
                mouseLock = false;
                Cursor.lockState = CursorLockMode.None;
            } else
            {
                Debug.Log("Locking cursor");
                mouseLock = true;
                Cursor.lockState = CursorLockMode.Locked;
            }
        }

        // Only move mouse when cursor is locked
        // For menus and overlays to prevent movement
        if(mouseLock == true)
        {

            // Handle movement based on mouse
            float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity * Time.deltaTime;
            float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity * Time.deltaTime;

            xRotation -= mouseY;
            xRotation = Mathf.Clamp(xRotation, -90f, 90f);

            transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
            playerBody.Rotate(Vector3.up * mouseX);
        }
    }
}

PlayerMovement.cs

using UnityEngine;

[RequireComponent(typeof(CharacterController))]
public class PlayerMovement : MonoBehaviour
{

    public CharacterController controller;

    public float speed = 12f;
    public float gravity = -9.81f;
    public float groundDistance = 0.4f;
    public float jumpHeight = 3f;

    public Transform groundCheck;

    Vector3 velocity;

    bool isGrounded;

    public LayerMask groundMask;

    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {

        isGrounded = Physics.CheckSphere(groundCheck.position, groundDistance, groundMask);

        if (isGrounded && velocity.y < 0)
        {
            velocity.y = -2f;
        }

        float x = Input.GetAxis("Horizontal");
        float z = Input.GetAxis("Vertical");

        Vector3 move = transform.right * x + transform.forward * z;

        controller.Move(move * speed * Time.deltaTime);

        if (Input.GetButtonDown("Jump") && isGrounded)
        {
            velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
        }

        velocity.y += gravity * Time.deltaTime;

        controller.Move(velocity * Time.deltaTime);
    }
}