Single.php won't show Wordpress posts

I’ve got an index.php, front-page.php, and now I wanted to add a single.php for regular blog posts. I’ve watched the tutorial but my posts still won’t show up.

Here is the code I’m using:

  <main class="container" wp-site-content>
    <div class="container">

Heading 1


The WP post body will be here.

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@bianca I think there was an issue pasting your code. Have you looked at this video about creating single.php in Pinegrow?