This is where i am putting them…Is it a difference if the shortcode comes from the template and not from wp core?

Also i need to do everythign to get it right..
I mean add text with shortcode, click on text/html AND on text and also to preview it.

this is kinda of what i am looking, but what if i want to customize this?

I mean generally if i want to add something like this somewhere, what are my options? I want to avoid putting php code directly in my page

<h2>Recent Posts</h2>
<ul>
<?php
	$recent_posts = wp_get_recent_posts();
	foreach( $recent_posts as $recent ){
		echo '<li><a href="' . get_permalink($recent["ID"]) . '">' .   $recent["post_title"].'</a> </li> ';
	}
?>
</ul>