There is no one-size-fits-all scanning method. You should consider the following factors before deciding which scanning method is best for a given task:
The amount of time you have to scan, your level of experience, the size of the scanned document, and the type of content that you are scanning. Some people prefer to read through documents paragraph by paragraph while others prefer to scan them in their entirety. The latter is typically better for text that has a lot of information and less words per page.