Get permalink to latest post in category

The function you are using here, get_post() does not accept query arguments. So you have to use get_posts(). Try this:

$latest_post = get_posts( array( 'cat' => 3, 'posts_per_page' => 1) );
if( !empty( $latest_post ) ) {
    echo '<a href= "' . get_permalink( $latest_post[0] ) . '">Learn More Now</a>';
}

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