'news' category posts in sidebar only (WPShower Sight theme)

Hi,

I am using a theme from WPShower called Sight, i think some are familiar with it.
I have done some of my own mods and am pretty happy with how it looks.

https://www.josiahemsley.com/wordpress

I am now wondering if someone can point out how i could limit the posts that appear in the sidebar on the right to just ‘news’ category posts (kind of a blogroll) . Then also limit the posts shown in the main homepage list/grid so that the ‘news’ category posts are not included.
Then all the ‘news’ posts can be seen in the News link from the top-right menu.

Thank you in advance for any suggestions!