Show latest and related articles from 3 different blogs

@franp. is correct, but in case you want to go a code route here’s how you get an RSS Feed of a website. You can duplicate this as you see fit, or combine multiple into an array etc.

Let’s get our RSS Feed from ABC.com

$rss = fetch_feed('http://abc.com/feed');   // Or where ever that websites feeds are located. You can add query variables to narrow down categories too.
if ( ! is_wp_error( $rss ) ){               // If the feed exists we can do some stuff like limit how many we need.
    $maxitems = $rss->get_item_quantity( 10 );      // return 10 or if there is not 10 posts, return the max posts found.
    $rss_items = $rss->get_items( 0, $maxitems );   // Get posts sub 0 through posts sub $maxitems
}

Now let’s list our RSS Feed, if there is one

<ul id="delicious_feed">
    <?php if ( $maxitems == 0 ) : ?>
        <li>No Items Found.</li>
    <?php else : ?>
        <?php // Loop through each feed item and display each item as a hyperlink. ?>
        <?php foreach ( $rss_items as $item ) : $i++; ?>
            <li>
                <a href="https://wordpress.stackexchange.com/questions/147646/<?php echo esc_url( $item->get_permalink() ); ?>" target="_blank"
                    title="<?php printf( __( 'Posted %s', 'my-text-domain' ), $item->get_date('j F Y | g:i a') ); ?>">
                    <?php echo esc_html( $item->get_title() ); ?>
                </a>
                <?php $item->get_description(); ?>...
            </li>
        <?php endforeach; ?>
    <?php endif; ?>
</ul>