Exclude category from blog

Hey!

Is it possible to exclude category from a blog page? I tried with a code in functions.php and it was working but then it made my admin panel show errors. I also tried to exclude a category from index.php but that gave me errors also.

I would like to have two different blogs, one for blog, and another one for news. So, I want to exclude one category id from main blog and show that category on a another page.

After everything is ok with categories how can I show only “news” category id posts on one page and without sidebar?

Thanks