Make it as easy as possible for users to go from general content to the more specific content they want on your site. Add navigation pages when it makes sense and effectively work these into your internal link structure. Make sure all of the pages on your site are reachable through links, and that they don't require an internal "search" functionality to be found. Link to related pages, where appropriate, to allow users to discover similar content.
Wikilinks are visibly distinct from other text, and if an internal wikilink leads to a page that does not yet exist, it usually has a different specific visual appearance. For example, in Wikipedia wikilinks are displayed in blue, except those that link to pages that don't yet exist, which are instead shown in red. Another possibility for linking is to display a highlighted clickable question mark after the wikilinked term.
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2. It could be easier to get a backlink with a jumplink especially to your long article/page, as it is easier to create/add linkable content to your current long page. Instead of creating a totally new page. And for the site who would link to you it would be more relevant if the link goes directly to the part of the page where they are referring to in the backlink.
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