This article describes the background leading up to my blog "Chris's Investment Diary" and my approach to trading. The content of "Chris's Investment Diary" reports on daily trading activity for a single ticker, "NEXTFUNDS Nikkei 225 Leveraged Index ETF (1570)," with a mix of humor and seriousness, starting from my own trading records and continuing to the present. Two years have passed since I started the blog, and recently more new readers have begun visiting, so I decided to begin a series to explain the overall picture that has led us here. Stock investment involves a large number of participants, and investment methods and styles vary widely, making it impossible to cover everything in a single statement. I would be grateful if you could read with a sense that there are many possible approaches. The series will be updated several times a week. In addition, the serialized articles are divided into free and paid sections. The paid articles include details such as actual trade volumes used, references cited in the articles, and information from sites consulted. For daily investment commentary, please see the site "Chris's Investment Diary." It is updated daily about 1–2 times. https://le8tlove.at.webry.info/