The very beginning of a white paper would also be a good section for placing a legal notice or a disclaimer, which should contain any important restrictions or notifications. These may be about exempting certain countries residents from buying the projects tokens due to local laws, or simply letting future investors know that the investment itself wont guarantee profits.
Perhaps one of the most important steps in writing pretty much any document is writing a compelling introduction. A good move would be presenting the introduction in the form of a letter from a CEO addressing future token holders.
This section is where you need to outline the problem that your project intends to solve, providing an explanation of why is this problem important, and maybe even touching upon the consequences of not solving it.
This is where you need to grab the reader's attention, explain the benefits of reading the document and provide an overview of what they can expect from it. Use any tool available to do so: charts, graphics and so on.