Microsoft Word has one primary button to make things bold, and that's in the Home tab. Since it's such a common tool, it also appears in the cursor toolbar, so

Microsoft Word has one primary button to make things bold, and that's in the Home tab. Since it's such a common tool, it also appears in the cursor toolbar, so make that two. Of course, you can also use keyboard shortcuts or add it to the user-customizable Quick Access Toolbar, but that applies to anything.