How i can build my own Backlinks Indexer ?

i see a lot of vide-coded indexer tools and i think that they are using the same technique to index backlinks and i want to know what they are using and how i can build my own personal backlink indexer to index my own links ?
The most important step in this task is to realize that finding a backlink and indexing it are two separate processes I’d begin with verifying crawlability page access and internal links on the pages where your backlinks are located it would be quite interesting to know what techniques indexers employ in addition to URL submission
 
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