Velocity keeps making object flip

Questions & Answers
1

The object keeps flipping and I cant use freeze rotation help pls
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MovementScript : MonoBehaviour
{
    private const bool f = false;
    private const bool t = true;

    public Rigidbody rb;
    public float Speed;
    public float JumpForce;
    
    
    bool IsGrounded;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        float XMove = Input.GetAxisRaw("Horizontal");
        float YMove = Input.GetAxisRaw("Vertical");

        rb.velocity = new Vector3(XMove, rb.velocity.y, YMove);

        if (Input.GetKey(KeyCode.Space) && IsGrounded)
        {
            rb.velocity = Vector3.up * JumpForce * Time.fixedDeltaTime;
        }
    }

    private void OnCollisionStay(Collision collision)
    {
        if (collision.collider.gameObject.tag == "Ground" )
        {
            IsGrounded = t;
        }
        else
        {
            IsGrounded = false;
        }
    }

}
2

Go to the Rigidbody component in the Inspector of the gameobject you have the script on, open the Contraints tab, and tick ON all of the Rotation contraints.