Air Control While Jumping?

so i'm trying to make a 3rd person platformer. everything works absolutely fine as it is. but what i want to be able to do is control the players direction while he is in the air/jumping. i have tried a lot of things so far and done a bit of research. i just cant seem to figure is out.. now i am only learning i an very new to coding. im just hoping that someone can push me in the right direction to get this to work. Thank-you!

     [Header("Speed/Movement Settings")]
     public float crouchSpeed = 2.5f;
     public float walkSpeed = 5f;
     public float runSpeed = 10f;
     public float maxSlopeLimit = 45f;
     private float speed; //the walk speed of the player
 
     [Header("Jumping/Gravity Settings")]
     public bool doubleJump; //bool for single of double jump
     public bool airMove;
     public float jumpForce = 15f; //how fast the player will move up when jumping
     public float gravity = 35f;    //how strong/fast gravity will pull you down
     public float airControl = 0.25f;
 
     [Header("Camera Settings")]
     public GameObject cam; //the camera used for the player. mainly here for the Up/Down look and Clamp.
     public float lookSensitivityX = 2f; // sets the sesitvity of the mouse Left/Right
     public float lookSensitivityY = 0.75f; // sets the sesitvity of the mouse Up/Down
     public float minLookY = -60f; //clamps the player look Down rotaion minimum
     public float maxLookY = 75f;    //clamps teh player look Up rotaton maximum
 
     Vector3 moveDir = Vector3.zero;
 
     int jumpTimes;    //how many times the player will be able to jump in the air
 
     float rotY;    //the rotaion of the camera UP/DOWN
     float rotX;    //the rotation of the camera LEFT/RIGHT
 
     void Update () // happens every frame
     {
         CharacterController controller = gameObject.GetComponent<CharacterController>(); // gets the character controller attached to the player.
 
         float ih =  Input.GetAxisRaw ("Horizontal"); // get the input of the horizontal axis (X)
         float iv = Input.GetAxisRaw ("Vertical");    // gets the input on the verticle axis (Z)
 
         if (controller.isGrounded) // if the player is on the ground
         { 
             if (Input.GetKey (KeyCode.LeftShift)) //if the Left Shift Key is Held Down Speed will = to Run Speed
             { 
                 speed = runSpeed;
                 controller.center = Vector3.zero;
             }
             else if (Input.GetKey (KeyCode.C)) // but if the C key is held down speed will = the couch speed
             { 
                 speed = crouchSpeed;
             } 
             else //if neither of the above keys are being held down speed will = to the defualt Walk speed
             { 
                 speed = walkSpeed;
                 controller.center = Vector3.zero;
             }
 
             moveDir = new Vector3 (ih, 0, iv).normalized; //seting where we want the axis to be modified and how
             moveDir = transform.rotation * moveDir.normalized; // allows the player to be able to rotate and the same speed he moves( i think haha ) 
             moveDir *= speed; // sets how fast the player will move
 
             jumpTimes = 0; // set jump time to 0 so you are able to jump again
 
         } 
 
         if (!doubleJump) //checks if the double jump bool is FALSE
         {
             //Debug.Log ("NormalJump");    // will show if single jump is active (in the console)
             JumpFunc ();    // find and moves through the single jump function
         }
 
         if (doubleJump) //checks if the double jump bool is TRUE
         {
             //Debug.Log ("DoubleJump");     // will show if double jump is active (in the console)
             DoubleJumpFunc ();    // find and moves through the double jump function
         }
             
         moveDir.y -= gravity * Time.deltaTime;    // this will move the player downward at the speed on gravity.
 
         controller.Move(moveDir * Time.deltaTime);    // this will allow the player to actually be able to move.
         Debug.Log (speed); // will show the speed of the player (in the console)
 
         controller.slopeLimit = maxSlopeLimit;    // this will set the players slope limit to a specified ammount.
     }
 
     void LateUpdate() //happens every other frame?
     {
         rotX = Input.GetAxis ("Mouse X") * lookSensitivityX;        //Sets up the mouse to look left and right
         rotY -= Input.GetAxis ("Mouse Y") * lookSensitivityY;        //Sets up the mouse to look up and down
 
         rotY = Mathf.Clamp (rotY, minLookY, maxLookY);    //Clamps the up and down rotation
 
         transform.Rotate (0, rotX, 0);    //Allows you to look left and right
         cam.transform.localRotation = Quaternion.Euler(rotY, 0, 0);    //Allows you to look up and down (with boundries -- Clamp)
     }
         
     void JumpFunc()    //single jump function
     {
         if (jumpTimes < 1) //see if the amount of times you have jumped is below 1
         {
             if (Input.GetButtonDown ("Jump")) //see if the space bar has been pressed 
             {
                 moveDir.y = jumpForce;    // move you upwards ad the speed of "jump force"
                 jumpTimes += 1; // +'s 1 on to the jump time so then it will be 1 meaning youll be able to jump one more time which will then make jump time = 2 which is not lower then 2. will not be able to jump again till on the ground
             }
         }
     }
 
     void DoubleJumpFunc()    //double jump function
     {
         if (jumpTimes < 2) //see if the amount of times you have jumped is below 2
         {
             if (Input.GetButtonDown ("Jump")) //see if the space bar has been pressed 
             {
                 moveDir.y = jumpForce;    // move you upwards ad the speed of "jump force"
                 jumpTimes += 1; // +'s 1 on to the jump time so then it will be 1 meaning youll be able to jump one more time which will then make jump time = 2 which is not lower then 2. will not be able to jump again till on the ground
             }
         }
     }
 }