Reports from the ESA regarding digital piracy threats often include discussions on high-traffic repack sites.

Because this term is often associated with niche media distribution or "repacks" (compressed versions of larger media files), finding a "good guide" depends on whether you are looking for information on the content itself or the technical side of handling such files. Content Overview

Repacks often include cracks and injectors. Defender will flag AMELIE_Loader.exe as a risk. It is likely a false positive, but only disable real-time protection during the installation folder’s whitelisting.

The Amelie repack preserved a game that was otherwise unplayable on modern GPUs due to a Unity 2018 bug. Many consider it a preservation release rather than a pirated one.

: Sites hosting "repacks" for obscure video content frequently use deceptive download buttons that lead to adware, browser hijackers, or trojans Phishing Hazards