In this study, we used the activity of self-made textbooks by the students in the lower secondary school second grade unit "How Electric Current Works," analyzed the activity of the students, and examined its effects. As a result, the following became clear: ● Students can achieve correct results by doing the experiments by themselves. ● Students can understand the basics of learned subjects like scientific terms by devising their own explanations. ● Students can create developmental and supplemental learning by themselves.