I learned that the method of adjusting font size varies with the operating system and application scenarios. In Windows system, it can be adjusted through the settings in the control panel, mouse wheel or application. In Mac system, it can be adjusted in system preferences and shortcut keys; In mobile devices, adjustments can be made in settings and in-app settings. Generally speaking, it is not difficult to find the font size adjustment function, but it is difficult to find the font size suitable for your reading habits.