How to change home page only in WordPress

You should use custom template for this purpose. Create a new file homepage.php and write the below code.

  <?php
    /*
    Template Name: Homepage
    */
   ?>
  <?php
  <!--Your code goes here-->
  ?>

Then, create a new page in admin panel like HOME and in right sidebar select your “homepage” template you just created. Do not forget answer given by WisdmLabs. You will also have to follow those answer.