MS Word provides the very quick very useful command name quick access Toolbar which helps you to create your own shortcut Commands

On Top left corner click the below icon showing in screenshot and get the Quick Access tool bar. If you want to add any command you just need to click on that command and it will show the check icon that means your command is selected. And if you want to remove from Quick access then you need to click on that newly added command again to uncheck that.

If you want to change the location of quick acess tool bar click  “show below the ribbon”

Here quick access tool bar ribbon location is changed.