The document discusses lessons learned from applying the Getting Things Done (GTD) productivity system. It warns against making too many lists, trying to connect every action to a project, and putting projects on context lists. It also cautions spending too much time setting up apps instead of getting work done, and stresses that the motivation for using GTD is more important than the tools or system used. The key is to trust the process, avoid overcomplicating it, and stick to the system rather than getting distracted by perfecting the setup.