Unit 1 was about reading a writer's situation. Unit 2 is about the audience on the other end: what they value, how writers appeal to them, how to pick evidence that does a specific job, how much evidence is enough, and how a thesis holds the whole argument together.
Writers make choices based on what they believe their audience values, believes, needs and already knows. To achieve a purpose, they try to connect with the audience's emotions and values, not just state their own.
Arguments persuade or motivate action through appeals. Ethos builds the writer's credibility, pathos engages the audience's emotions and values, and logos uses reasoning and evidence. Most strong arguments combine them.
Writers choose evidence to do a specific job: to illustrate or exemplify a point, to clarify it, to set a mood, to associate it with something else, or to amplify it. Asking what job a piece of evidence does is the first step in analyzing it.
Strategically chosen evidence strengthens reasoning, connects with the audience and builds the writer's credibility. An argument also needs enough evidence: sufficiency depends on both the quantity and the quality of support.
A thesis is the main, overarching claim an argument defends. It isn't always stated in one sentence, and some texts imply it. When it is stated directly, it is a thesis statement. Your essays must state a thesis that needs proof and may preview the line of reasoning.