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At the moment, the sitelinks are automated. However, there are best practices that can be followed to improve the quality of your sitelinks. For example, for internal links from your site, use anchor text and text with attribute alt informative, compact and without repetition.
For more help on sitelinks go to this topic.
For hints related to the internal link and anchor texts go to this topic.
No, very different !
– Ikaro Sales
This indexing is done automatically and only appears when the search is highly relevant to a particular site.
– Bruno Wego
The answer there answers your question yes, therefore, it is a duplicate. It does not need to be the same question, but rather that the answer for both is the same.
– user28595