Give me some notes on Question tag,concord and paragraphing

Question Tag: A question tag is a short question added at the end of a declarative sentence. It is used to confirm information or to seek agreement. The tag usually consists of an auxiliary verb and a pronoun. If the main sentence is positive, the tag is negative, and vice versa.
Example: "It's a beautiful day, isn't it?"

Concord: Concord, or agreement, is the grammatical relationship between words in a sentence. The most common type is subject-verb concord, where the verb must agree in number with its subject.
Example: "The dogs bark." (Plural subject, plural verb) vs. "The dog barks." (Singular subject, singular verb).

Paragraphing: Paragraphing is the practice of organizing written text into distinct units called paragraphs. Each paragraph typically focuses on a single main idea or topic. A new paragraph is usually indicated by an indentation of the first line or by a blank line between paragraphs. This helps to improve readability and structure.