Posts for Specific Pages

I’ve done a lot of reading on the subject but I’m not sure still how to do this. I want to be able to post to my main post page:

https://www.fergusonfinancial.ca/articles-worth-reading/

But then also put specific posts on specific pages. For instance I’d like a post about Rent to Own investing on my main page listed above but also on https://www.fergusonfinancial.ca/real-estate-investing/rent-to-own-real-estate-investing/ in a widget on the side of the page.

Please help but go slow, I’m new.

Devon