when you open the spreadsheet-set the margins first-a dotted box will appear-you edit in the dotted box-don't go beyond the dotted box-otherwise the excess part can't be printed-the first line is usually the title line-starting from the second or third line-and enter your information, no matter how many columns there are, it must be in the dotted box-after the input is completed. Because it doesn't need a border)-Click Format in the menu bar-Cells-Borders-Outer Borders-This is to set the border for your input-and you can also set the "alignment" mode in the cell dialog box-generally, both horizontal and vertical are set to center or normal, so it's up to you.

Note: Almost all the formats you want to set for the table are in the Cell dialog box in the Format menu. Open it yourself and practice to know their purpose.