So it seems we can use aside to display content that is partially or indirectly related to the intended information (source: https://html.com/tags/aside/)
Fitting scenarios -
Covid alert!!!! (Ofcourse what else!)
References
sidebars
additional information
website sidebars unrelated to the content
ads
A very good answer that supports aside is the best fit to display ads.
Unfitting scenarios -
blog posts
intended information
(directly related information to the purpose of your application)
Did you notice role="note" in the first image?
In order to make the structure more accessible to user agents that support ARIA as well as ensuring that user agents that don't support HTML5 can also understand the structure, adding the ARIA role="note" as follows or is advised.
Example of the aside tag with an accessible solution (Covid Alert) -
https://codepen.io/rxjskesh/details/PoGXxGb
Browser support (full support) -
https://caniuse.com/?search=aside
Understand how close HTML is to the top, do it right and you won't be fixing bugs in javascript :) keep it simple and direct.
i have approved this for now, but please write longer articles in the future