My question actually has two parts:
1- How can I create a gray background for a paragraph like this using latex?
Lorem ipsum
Lorem ipsum
Lorem ipsum
Lorem ipsum
2- How can I highlight just a little part of the text like this using latex?
Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum.
Edit 1: Markdown package got recommended to me below but below package does not use block quotes or highlights. Is it possible to use them with markdown package and if it is how?
Edit 2: I am now able to create gray background blocks using tcolorbox but I stil cannot highlight small groups of texts(1 or 2 words)(2. question still unanswered)
tcolorbox. But I am not able to create gray background(highlight) for a word or 2. like I did in this comment for highlightingtcolorboxusing latex. – Ersel Hengirmen Aug 26 '21 at 02:32\tcbox{some highlighted text}– Phelype Oleinik Aug 26 '21 at 02:37soul, orlua-ulor drawing highlighted regions with tikz. From my point of view, the easiest is to uselua-ul. – Tomáš Kruliš Aug 26 '21 at 06:37