What do I do lol

Hey, guys, I am very new to Unity and I followed this tutorial on how to make my character move…
code↓
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
[SeralizeField] private float _speed = 7.5;
[SeralizeField] private Rigidbody _rb;
[SeralizeField] private float _jumpforce = 300;

void Update() {
    var vet = new Vector3(Input.GetAxis("Horizontal"), 0,  Input.GetAxis("Vertical)) * _speed;
    vel.y = _rb.velocity.y;
    _rb.velocity = vel;

    if(Input.GetKeyDown(KeyCode.Space)) _rb.AddForce(Vector3.up *  _jumpForce);
    
}

}
Yet it is showing these 4 errors (I fixed the 4th one myself somehow lol):
err 1: [15:19:18] Assets/PlayerController.cs(12,78): error CS1010: Newline in constant
err 2: [15:19:18] Assets/PlayerController.cs(12,99: error CS1003: Syntax error, ‘,’ expected
err 3: [15:19:18] Assets/PlayerController.cs(13,31): error CS1026: ) expected

You forgot a " at the end of Vertical,


var vet = new Vector3(Input.GetAxis(“Horizontal”), 0, Input.GetAxis(“Vertical”)) * _speed;

[SerializeField] private float _speed = 7.5f; 
    [SerializeField] private Rigidbody _rb; 
    [SerializeField] private float _jumpforce = 300;

    void Update()
    {
        // Forgot a " at the end of Vertical
        var vel = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical")) * _speed;

        
        vel.y = _rb.velocity.y;
        _rb.velocity = vel;
        if (Input.GetKeyDown(KeyCode.Space)) 
            _rb.AddForce(Vector3.up * _jumpforce);

    }