@mabdallay By the way, as to the question of line breaks: as I mentioned, the “pure” standard markdown syntax is that you need an empty line between two paragraphs so that they will correctly be rendered as two separated paragraphs. However, you can change this behavior in Settings → Editor: turn of the “strict line breaks”. But be aware that in this case your text will be rendered differently if you open your file with another markdown editor that only supports standard syntax/rendering!
For basic markdown syntax as well as some of its extensions you can find a good overview here .