full post of 1 post and excerpt of others

another example
https://ifelse.co.uk/

i need help on this

Then why don’t you ask the owners of the two blogs you linked to. A polite question/request sometimes makes miracles ??

oh i didnt think of that.
well anyway i did some reading and came up with this

<div id="content">
<?php query_posts('posts_per_page=3');
$postnum = 2; ?>
<?php if (have_posts()) :?>
<?php $postCount=0; ?>
<?php while (have_posts()) : the_post();?>
<?php $postCount++;?>
<div class="entry entry-<?php echo $postCount ;?>">
<div class="entrybody">
<?php if ($postnum == $postCount) {
the_excerpt('Continue Reading the Post');
} else {
the_content('Read the rest of the Post'); } ?></div>


how can i make it show the excerpt for post 2, 3 and so on

You need to modify your loop by adding an incrementing variable and a condition. Check this out, it explains it pretty well:

https://troidus.com/article/6