I am creating an wordpress custom theme.I have created a top bootstrap menu that contains my pages.I have added the pages to the menu using functions.php.Here is the code for menu. require_once('wp_bootstrap_navwalker.php');
register_nav_menus( array(
    'primary' => __( 'Main Menu', 'News of Bangla' ),
    ) );
<nav class="Row navbar navbar-inverse navbar-fixed-top" role="navigation"> <!-- Top Navigation Menu Starts -->
        <div class="navbar-header">
        <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
        </button>
        </div>
        <?php
        wp_nav_menu( array(
                    'menu'              => 'Main Menu',
                    'theme_location'    => 'primary',
                    'depth'             => 2,
                    'container'         => 'div',
                    'container_class'   => 'collapse navbar-collapse navbar-ex1-collapse',
                    'menu_class'        => 'nav navbar-nav',
                    'fallback_cb'       => 'wp_bootstrap_navwalker::fallback',
                    'walker'            => new wp_bootstrap_navwalker())
                );
        ?>
    </nav> <!-- Main Navigation Menu Ends-------- -->
Now i want to go to page.php when i click on the menu.I also want to get all the posts of that category under that page i have clicked.How can i do that?
 
    