If you select some text in the editor editable 
 region and right-click it, a pop-up menu will be displayed containing 
 the available action options:
The text contextual menu provides the following operations:
Cut -copy the selected text to the clipboard and remove it from page. This menu entry performs the same action as the Cut command in the toolbar.
Copy - copy the selected text to the clipboard and leave it in page as well. This menu entry performs the same action as the Copy command in the toolbar.
Paste 
 - replace the selected text with the content from the clipboard (or simply 
 place that content where the cursor lays, if there is no selection). If 
 no content is in the clipboard, the option is disabled.
	This menu entry performs the same action as the Paste command 
 in the toolbar.
Paste from Word - replace the current 
 selection with the clipboard content, content that is copied from Microsoft Word. Whenever you try to paste content 
 from Word, you will be asked if to first clean 
 it of all the Microsoft Word formatting tags, 
 and only then will it added in the page:
	
	
	                              
	You can see the Paste from Word command as 
 a mixture between the Paste command and the 
 Clean Word Markup command.
	                              
	If the content you copied from Microsoft Word 
 includes images, when you paste it in the editor 
 area you'll notice that images are replaced by a generic placeholder so 
 that you will not lose track of them and their position:
	
	
	                    
	This way you will easily upload and then insert the needed images in 
 page.
Save as Template - save the selection as a separate template file. Read more about this here.
Spellcheck - start the spellchecking process of the current text selection. Read more about the window that pops-up here.
Clean content - this entry is a sub-menu that expands while hovering the mouse cursor over. Read about its role and the three options here.
Note: On Mozilla the Cut, Copy, Paste, and Paste from Word menu entries are disabled due to a security feature. Read this technical note for details.
As you noticed, the right-click contextual menu groups together options often needed. Use it whenever you want to save time with accessing certain commands.