Hello i am a begginer in unity can you please help me

Getting Started
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1 
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AirplaneController : MonoBehaviour {

    public float FlySpeed = 5;
    public float YawAmount = 120;

    private float Yaw;

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

        // move forward
        transform.position += transform.forward * FlySpeed * Time.deltaTime;

        // inputs
        float horizontalInput = Input.GetAxis("Horizontal");
        float verticalInput = Input.GetAxis("Vertical");

        // yaw, pitch, roll
        Yaw += horizontalInput * YawAmount * Time.deltaTime;
        float pitch = Mathf.Lerp(0, 35, Mathf.Abs(verticalInput)) * Mathf.Sign(verticalInput);
        float roll = Mathf.Lerp(0, 35, Mathf.Abs(horizontalInput)) * -Mathf.Sign(horizontalInput);

        // apply rotation
        transform.localRotation = Quaternion.Euler(Vector3.up * Yaw + Vector3.right * pitch + Vector3.forward * roll);

    }
}
2

It looks to me like you are moving the transform, and, in an update function. I could be wrong, but it seems that isnt going to consider the collision.

You will want to look into moving a rigidbody, or character controller, and also, using fixed update for most of the management, other than input.

3

Use CODE tags when displaying code please.