Remove category text

I don't know how to remove certain text elements as shown from showing up on all my pages. Please see the attached image.

1) the "category: lifestyle" text
2) the double lines below
3) the "travel" category text
4) the "written by" text.

I only want to keep the title of the article and that's it. Please advise me how to remove the rest.
And some of the words are in green color, which is all throughout, how do I change that back to black?

Many thanks in advance!