Usually on an home page, you don't have pagination. You can show the last 4 post with a link to the Blog page
Use the blogPosts component to display a list of latest blog posts on a page.
see documantation here : https://octobercms.com/plugin/rainlab-blog
title = "Accueil"
url = "/"
layout = "default"
is_hidden = 0
[blogPosts]
pageNumber = "{{ :page }}"
postsPerPage = 4
noPostsMessage = "No posts found"
sortOrder = "published_at desc"
categoryPage = "actualite"
postPage = "blog-detail"
==
{% set posts = blogPosts.posts %}
{% for post in posts %}
<div class="col-sm-3 col-xs-6">
<figure>
<a href="{{ post.url }}"><img
data-src="{{ first.filename }}"
src="{{ post.featured_images[0].thumb(250, 166) }}"
alt="{{ first.description }}"
/></a>
<figcaption class="bordered no-top-border">
<div class="info">
<h5><a href="{{ post.url }}">{{ post.title }}</a></h5>
<p class="info">
{{ post.published_at|date('d.m.Y') }}
</p>
</div><!-- /.info -->
</figcaption>
</figure>
</div><!-- /.col -->
{% endfor %}
<a href="{{ 'blog'|page }}">All blog posts</a>
I hope this can help you