Reddit mentions of Introduction to Hadith

Are you interested in learning about hadith science in general and rijal? I recommend starting with An Introduction to Hadith by Abd Al-Hadi Al-Fadli.

I'm only familiar with these from a personal interest, I'm not a scholar, just read a bunch of books. In this case, I looked up the hadiths themselves since the book reference was given, and pretty much all hadith books are available online (at least in Arabic). It's obvious when a hadith has disconnected chain, and you can look up certain narrators in reference books of rijal (Khoei's book معجم رجال الحديث for ex. is available online), a handful of narrators are very common and you eventually just start remembering some of the names and unfamiliar ones stand out. I've also read a few writings by S. Khoei (ra) discussing certain fiqhi issues and how he arrives at a ruling, just to get a rough idea of how scholars determine rulings.