In a typical piece of writing, the author expresses two or three main ideas, or general messages, about a topic.
When you are looking for the main ideas in a piece of writing, consider the author's purpose.
If the author's purpose is to tell the story of how a company was created, like in the article on page 3-5, the main ideas will probably be about the steps that led to the creation of the company.
If the author wants to explain way a company is successful, like in the article on pages 3-5, the main ideas will be about the reasons behind the success.
If the author wants to express an opinion or examine multiple sides of an issue, the main ideas will be the general arguments about the issue.