Paragraph 3
Vertical reading involves relying on the text to determine the reliability or validity of information.
In school, students learn to examine an author’s credibility, their logic, and their
references based on only their text.
Having read a book, for example, a reader can review if the arguments presented in the text are supported by enough
evidence, look at who the author or the publisher is, or check the references cited in the text.
However, technology has changed the landscape in which people write and publish, making it necessary to change reading
strategies.

reliability
= credibility
= trustworthiness
Having read a book, for example, a reader can
review if the arguments presented in the text are supported by enough evidence,
look at who the author or the publisher is, or check the references cited in the text.
Having read a book은 주절보다 먼저 일어난 일을 나타내는 완료분사구문으로, 풀어서 After they (has) read a book으로 쓸 수 있다.
review if the arguments presented in the text are supported by enough evidence, look at who the author or the publisher is, check the references cited in the text 는 A, B, or C의 구조로 모두 can에 이어지는 병렬 구조이다.
However, technology has changed the landscape in which people write and publish,
making it necessary to change reading strategies.
기술 발전이 오늘날에 바꿔 놓은 결과를 현재완료인 has changed로 표현하였다.
it은 가목적어, to change reading strategies는 진목적어로 쓰인 to부정사구이다.