The tutorial that comes with Windows is a very good way of familiarising yourself with using a mouse in Windows. It also introduces Windows. A menu is displayed under Help. Type w to run the Windows Tutorial or Type m to run the mouse tutorial. Follow the instructions on the screen until you have completed the tutorial.
Most applications also have their own on-line help.
Help is always the last menu option on the right of the menu bar. To request help on a subject choose one of the options from the Help menu. Windows loads the help file for the currently active application. Move around the help system either by using the menu options, or by clicking on underlined topics, or by clicking the buttons shown below the menu bar. The Program Manager is the Windows software that is automatically started whenever you run Windows.