(This book adopts the method of environmental teaching and engineering diagrams, and the combination of books and trays forms interaction, so that readers can quickly get started. The whole book has a novel layout and two-color printing: the format is large, the layout is compact, and the knowledge capacity is far greater than that of similar books; the book is used in conjunction with the well-made multimedia interactive teaching CD, so that readers can apply what they have learned to achieve the best learning effect. This book is aimed at computer beginners and is the preferred reference book for the majority of computer primary, intermediate and home and office users.)