Wordpress show latest category posts from custom query - php

Question

in my category.php template i want to show the latest entries only if are of the same category, and when i execute the custom query shows every entries.
This is my code, how could i fix the error?
Code:
<?php
/**
* The template for displaying all single posts.
*
* #package Mundo Geek
*/
get_header(); ?>
<div id="primary" class="content-area">
<main id="main-single" class="site-main" role="main">
<div id="row">
<?php
$ultimas = new WP_Query();
$ultimas -> query('showposts=3');
while($ultimas -> have_posts()) : $ultimas ->the_post();
?>
<div class="category_page_last col-xs-12 col-sm-4">
<a href="<?php the_permalink(); ?>">
<div class="thumb">
<?php
if(has_post_thumbnail()){
//echo '<img src="'.$url.'"/>';x
$backgroundImageUrl = "('".wp_get_attachment_url( get_post_thumbnail_id($post->ID) )."')";
echo '<div class="category_page_img-background" style="background-image: url'.$backgroundImageUrl.'"></div>';}
else{
$default_thumb = "('".get_bloginfo( 'stylesheet_directory' )."/images/default-thumbnail.jpg')";
echo '<div class="category_page_img-background" style="background-image: url'.$default_thumb.'"></div>';
}
?>
<div class="encimaimagen"></div>
</div>
<div class="meta"><h1><?php the_title(); ?></h1></div>
</a>
</div>
<?php endwhile; ?>
</div>
<div class="row">
<div class="col-sm-8">
<section id="category_page">
<?php
$ultimas = new WP_Query();
$ultimas -> query('showposts=40');
while($ultimas -> have_posts()) : $ultimas ->the_post();
?>
<article class="col-xs-12 archivo row">
<a href="<?php the_permalink(); ?>">
<h1><?php the_title(); ?></h1>
</a>
<div class="hidden-xs col-sm-4 col-md-3"><?php the_post_thumbnail( 'thumbnail' ); ?></div>
<div class="col-sm-8 col-md-9"><?php the_excerpt(); wp_reset_postdata();?></div>
</article>
<?php endwhile; ?>
</section>
</div>
<div class="col-sm-4 hidden-xs"><?php get_sidebar(); ?></div>
<div class="index_archivo col-xs-12">
<a href="<?php $url = home_url( $path = 'index.php/archivo', $scheme = relative ); echo $url;?>">
<h2>Ver todas las entradas</h2>
</a>
</div>
</div>
</main><!-- #main -->
</div><!-- #primary -->
<?php get_footer(); ?>
Thank you guys!

Answer 1

To display latest posts from a certain category, your code needs to look something like this:
<ul>
<?php
global $post;
$myposts = get_posts('numberposts=5&offset=1&category=3');
foreach($myposts as $post) :
setup_postdata($post);
?>
<li><?php the_title(); ?> </li>
<?php endforeach; ?>
</ul>
Source: https://wordpress.org/support/topic/recent-posts-from-specific-category