Breadcrumbs is a set of links that can help a user understand and navigate a website hierarchy. Tell the user where he is and where he can go. Don't let it get lost in the sections and subsections of your site. It is important to make navigation user-friendly.
However, you can mark some of the breadcrumbs items in a way that is convenient for the user when they appear in search results.
https://schema.org/BreadcrumbList
Sitelinks
There are best practices you can follow, however, to improve the quality of your sitelinks. For example, for your site's internal links, make sure you use anchor text and alt text that's informative, compact, and avoids repetition.
Web pages Links
If you require additional links for web pages, use the Table of Contents.
