Nonmaterial culture include beliefs, family patterns, ideas, language, political and economic systems, rules, skills, and work practices. Non material culture are the intangible aspects of culture such as beliefs, language and ideas while the tangible aspects of culture are referred to as material culture, this includes foods, ways of dressing.
a central idea is a main point that the other is making.in other words,central idea is what are the article is mostly about.you can think of a central idea as a thesis statement : one sentence that states what the article is about.
