How to have more than one page for your posts if you have 8 posts but can store max 4 on a page

The term you are looking for is Pagination.

Placing this code inside the loop should work:

<div class="nav-previous alignleft"><?php next_posts_link( 'Older posts' ); ?></div>
<div class="nav-next alignright"><?php previous_posts_link( 'Newer posts' ); ?></div>

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