Remove default metabox in post editor from non-admins.

functions.php

<?php

function afn_remove_post_metabox() {
    if( !current_user_can('manage_options') ) {
    remove_meta_box( 'postexcerpt', 'post', 'normal' ); // Excerpt Metabo
    remove_meta_box( 'trackbacksdiv', 'post', 'normal' ); // Trackback Metabox
    remove_meta_box( 'postcustom', 'post', 'normal' ); // Custom Fields Metabox
    remove_meta_box( 'commentstatusdiv', 'post', 'normal' ); // Comments Status Metabox
    remove_meta_box( 'commentsdiv', 'post', 'normal' ); // Comments Metabox
    remove_meta_box( 'revisionsdiv', 'post', 'normal' ); // Revisions Metabox
    remove_meta_box( 'authordiv', 'post', 'normal' ); // Author metabox
    remove_meta_box( 'slugdiv','post','normal' ); // Slug Metabox
    remove_meta_box( 'tagsdiv-post_tag','post','side' ); // Tags metabox
    remove_meta_box( 'submitdiv','post','side' ); // Date, status, and update/save metabox 
    remove_meta_box( 'categorydiv','post','side' ); // Categories metabox
    remove_meta_box( 'postimagediv','post','side'); // Featured image metabox
    }
}

add_action( 'admin_menu', 'afn_remove_post_metabox' );