Check out example codes for "bootstrap Accessibility". It will help you in understanding the concepts better.

Code Example 1

Since breadcrumbs provide a navigation, it’s a good idea to add a
meaningful label such as aria-label="breadcrumb" to describe the type 
of navigation provided in the <nav> element, as well as applying an 
aria-current="page" to the last item of the set to indicate that it 
represents the current page.

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