Formal learning resources include textbooks, course books, storybooks, dictionaries, and source books which are used in institutional settings like schools under an established curriculum. Informal learning occurs outside classrooms through resources like libraries, language labs, e-books, films, blogs, language institutions, museums, spoken English centers, and literary clubs in a more spontaneous, flexible way without a set curriculum. Both formal and informal learning resources help teachers make language teaching more effective and promote students' language development.