form to post multiple inputs into post_content

I have a form, with multiple inputs that I am trying to get posted to the wordpress “post_content”. I am able to get the title field and only one other field to post successfully, only when making a field name “description” instead of “description[]”, but have no idea how I can get the rest to submit into the post_content. I would like the inputs posted like the image I have created below.

https://i.stack.imgur.com/dRjCS.jpg

Here is the code I currently have that works for the title only.

<?php /* Template Name: Question Form */ ?>

<?php
if( ‘POST’ == $_SERVER[‘REQUEST_METHOD’] && !empty( $_POST[‘action’] ) && $_POST[‘action’] == “new_post”) {
if (isset ($_POST[‘title’])) {
$title = $_POST[‘title’];
} else {
echo ‘Please enter a title’;
}
if (isset ($_POST[‘description’])) {
$description = $_POST[‘description’];
} else {
echo ‘Please enter the content’;
}
$tags = $_POST[‘post_tags’];
$new_post = array(
‘post_title’ => $title,
‘post_content’ => $_POST[‘description’],
‘post_parent’ => 599,
‘post_status’ => ‘publish’,
‘post_type’ => ‘topic’
);
$topic_meta = array(
‘forum_id’ => $new_post[‘post_parent’]
);
$topic_id = bbp_insert_topic($new_post, $topic_meta);
wp_redirect(get_permalink($topic_id)); exit;
}
?>

<form id=”new_post” name=”new_post” method=”post” action=””>

<p class=”question”><label>Title</label><input name=”title” type=”text”></p>

<p class=”question”><label>Description</label><input name=”description[]” type=”text”></p>

<p class=”question”><label>Your First Name</label><input name=”description[]” type=”text”></p>

<p class=”question”><label>Your Last Name</label><input name=”description[]” type=”text”></p>

<p align=”right”><input type=”submit” value=”Publish” tabindex=”6″ id=”submit” name=”submit” /></p>

<input type=”hidden” name=”action” value=”new_post” />

<?php wp_nonce_field( ‘new-post’ ); ?>

</form>

I don’t know how to add the other fields to be a part of post_content.

I have tried a few other things, but have been unsuccessful. I would appreciate any help very much!