Supportive tools play a crucial role in project-based learning. They help students build their cognitive scaffolds, improve learning efficiency, enhance learning efficiency, develop critical thinking skills, and foster overall development. In project-based learning, teachers can build a teaching toolbox through three approaches: first, by selecting effective existing tools to address real-world problems; second, by designing discipline-specific tools that support the development of students' knowledge and skills; and third, by offering a range of tools that support personalized learning. Providing supportive tools is not the final goal of project-based learning. By reserving general tools, offering suitable ones, and removing tools when necessary, teachers can nurture students' abilities, helping them move from “assistance” to “self-reliance”.