With sections, you can organize your blocks and pages under some specific categories. For instance, you can create a Blog section and display pages and blocks under it.
In order to render a page by section code, use:
<a href="{{ path('bitbag_sylius_cms_plugin_shop_page_index_by_section_code', {'sectionCode' : 'blog'}) }}">
{{ 'app.ui.blog'|trans }}
</a>
If you want to list blocks by specific section, use:
{{ render(path('bitbag_sylius_cms_plugin_shop_block_index_by_section_code', {'sectionCode' : 'blog', 'template' : '@BitBagSyliusCmsPlugin/Shop/Block/index.html.twig'})) }}