Can I buy a residential apartment and settle in Baiyun District, Guangzhou?

You can't. The apartment in Baiyun District of Guangzhou cannot be settled, because the land for building apartments is generally commercial land, which is generally used for office, which is very different from ordinary houses, so it cannot be settled, and buying a house is not the only condition for settling down, but only a prerequisite. If you want to settle down, you must meet other conditions.