Platforms with good search engine optimization implement paths to navigate every page via links. This is also useful for web archiving since both search-engine crawlers and web-archiving crawlers use similar mechanisms to discover all pages of content.
These guidelines also help a website crawler discover all content:
43. A sitemap can help website crawlers reach unlinked content
44. Use simple links to help a website crawler find content
46. Ensure each page state has its own unique URL