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Think of the main idea as an —umbrella“ idea. It is the author's primary point about a topic. All other material in the paragraph fits under the main idea. In a paragraph, authors often present the main idea to readers in a single sentence called the topic sentence.
He is motivated by vengeance for how he was treated.
Posture is the position of a body while standing or sitting. An example of posture is standing straight. Which also is a noun. It could mean the position in which someone holds their body when standing or sitting and a particular way of dealing with or considering something; an approach or attitude. Words that’s similar to the word posture is, attitude, pose, bearing, carriage, stance, aspect, condition, demeanor, presence, way of thinking and feeling.