Hereof, what does those in need mean?
"Those who are in need" means people who lack basic requirements for life usually food, shelter, heating, clothes, medical facilities, and so on.
Secondly, what does needs mean mean? noun. a requirement, necessary duty, or obligation: There is no need for you to go there. a lack of something wanted or deemed necessary: to fulfill the needs of the assignment. urgent want, as of something requisite: He has no need of your charity.
Correspondingly, is in need in a sentence?
He came in tired and hungry and badly in need of a bath. My car is in need of repair.
Who is in need or who are in need?
"Who" takes a third person singular verb form. "Who needs" is correct. Just a note: The word "I" is always capitalized in correct English.