Embed WP content onto a html page

I have a large html website. I don’t want to convert it to WP but I would like to use WP to update my index page where I post the news.

What would be the easiest approach? convert my index.html to a WP page? embed a wp page within my html page?
I have read articles and I got lost. These articles refer to divide the html onto header.php footer.php and sidebar.php. The problem is that the layout of my site is not as simple as that, I have more than one sidebar .

should i create a page on wp and call it news, if so, how can i show the content of this page on m index page.

please help and advice , I know about html but not much about WP or php

Obviously I want the layout to remain the same