Unity - Default player movement provided by Unity in some templates.

README.MD

1. Drop the PlayerControllerFPS prefab into the scene
2. Remove any primary cameras from the scene (the prefab comes with one).
3. Position as needed. Make sure Ground Check component lines up with Z-axis floor.
4. Press play!

PlayerControllerFPS.prefab

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PlayerMovement.cs

#if ENABLE_INPUT_SYSTEM 
using UnityEngine.InputSystem;
#endif

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

public class PlayerMovement : MonoBehaviour
{

    public CharacterController controller;

    public float speed = 12f;
    public float gravity = -10f;
    public float jumpHeight = 2f;

    public Transform groundCheck;
    public float groundDistance = 0.4f;
    public LayerMask groundMask;
    

    Vector3 velocity;
    bool isGrounded;

#if ENABLE_INPUT_SYSTEM
    InputAction movement;
    InputAction jump;

    void Start()
    {
        movement = new InputAction("PlayerMovement", binding: "<Gamepad>/leftStick");
        movement.AddCompositeBinding("Dpad")
            .With("Up", "<Keyboard>/w")
            .With("Up", "<Keyboard>/upArrow")
            .With("Down", "<Keyboard>/s")
            .With("Down", "<Keyboard>/downArrow")
            .With("Left", "<Keyboard>/a")
            .With("Left", "<Keyboard>/leftArrow")
            .With("Right", "<Keyboard>/d")
            .With("Right", "<Keyboard>/rightArrow");
        
        jump = new InputAction("PlayerJump", binding: "<Gamepad>/a");
        jump.AddBinding("<Keyboard>/space");

        movement.Enable();
        jump.Enable();
    }
#endif

    // Update is called once per frame
    void Update()
    {
        float x;
        float z;
        bool jumpPressed = false;

#if ENABLE_INPUT_SYSTEM
        var delta = movement.ReadValue<Vector2>();
        x = delta.x;
        z = delta.y;
        jumpPressed = Mathf.Approximately(jump.ReadValue<float>(), 1);
#else
        x = Input.GetAxis("Horizontal");
        z = Input.GetAxis("Vertical");
        jumpPressed = Input.GetButtonDown("Jump");
#endif

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

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

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

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

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

        velocity.y += gravity * Time.deltaTime;

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