Devs Forrest - Developer Community

First add this to functions.php

add_action( 'init', 'register_my_menus' );
 
function register_my_menus() {
register_nav_menus(
array(
'menu-1' => __( 'Menu 1' ),
'menu-2' => __( 'Menu 2' )
)
);
}

Add this to your theme.

<?php wp_nav_menu( array( 'theme_location' => 'menu-1', 'menu_class' => 'main_menu' ) ); ?>

Below are the params you can use

<?php $defaults = array(
  'theme_location'  => ,
  'menu'            => , 
  'container'       => 'div', 
  'container_class' => 'menu-{menu slug}-container', 
  'container_id'    => ,
  'menu_class'      => 'menu', 
  'menu_id'         => ,
  'echo'            => true,
  'fallback_cb'     => 'wp_page_menu',
  'before'          => ,
  'after'           => ,
  'link_before'     => ,
  'link_after'      => ,
  'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s</ul>',
  'depth'           => 0,
  'walker'          => );
?>