To help you find answers to your inquiries in the fastest possible way, try the search tool found at the top-right of every page on the forum first. Many of the topics have been covered in detail previously, but the search team may be the challenge here. The burning you are seeing are known as “traversal lines”. Bunch of posts on the subject including our FAQ.
I made a post about this just yesterday that should help. Have a read and please update as to how you get on.