There are multiple ways to perform the same function. For example, there are four ways to make a text bold.
First select the text that has to be made bold and then perform one of the following:
(a) Click menu option Format, select Text from the drop-down and then select Bold from the sub-menu.
(b) Click the Bold icon in the Formatting Toolbar
(c) Right-click and select Character. This will open a Character dialog box. Select Bold from the Stylebox and click OK.
(d) Press Ctrl+B on your keyboard.
In a similar way, most of the functions in LibreOffice can be performed in multiple ways. You can explore the menu options and the toolbars or use Help to see how a particular function can be performed.