Just wanted to know if it's possible to have unique sections for different blog posts or articles and how it can be achieved.
Ideally I don't want to use the HTML content provided for blog posts or articles.
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Shopify allows you to set up multiple unique blogs. One way to achieve your goal would be to setup a separate 'blog' for each section.
A blog in this case consists of two layouts - a list and an article.
Each blog could have its own link in the main menu making it appear as a different section.
The blog list and article templates are very basic and don't allow for much customization through the UI.
You can, however, customize the underlying templates using css/html/liquid.
This is an accepted solution.
If anyone has problems for adding sections to different articles, I have found an article that provides a work around that may provide useful.
IMPORTANT when sections are added and theme is changed from published (live theme) to unpublished all sections will be lost.