view the articles on the homepage

hello,

I’m a french user Arconix.
I am trying to display the last article in a Arconix category.
How to do? I am a beginner.

I know to display the last item of a class in wordpress is made:

<?php query_posts('cat=88&showposts=1'); while (have_posts()) : the_post(); ?>

<?php if(has_post_thumbnail())
echo get_the_post_thumbnail( get_the_ID(), array(295,120) );
 else {
$imgthumb = catch_that_image();
echo "<img src='".$imgthumb."' alt='".get_the_title()."'>";
 }?>

<?php
foreach((get_the_category()) as $cat) {
echo $cat->cat_name . ' ';
} ?> 

<?php the_title(); ?>

<?php the_excerpt(); ?>

<?php endwhile; ?>

How is it to display the last article category Arconix as homepage ???
Thank you in advance for your help !!

https://wordpress.org/plugins/arconix-portfolio/