Here’s a concise for Tomb Raider (2018), tailored to the 400MB Hindi HQ Dual Audio BluRay version you mentioned. It includes quality expectations, language info, and a quick verdict.
Simply put, a "Dual Audio" file is a video container (almost always the MKV format) that has more than one audio track muxed into it. In this case, the file would contain both the original English audio track and a professionally dubbed Hindi audio track. This provides an incredible amount of flexibility, allowing a group of friends with different language preferences to watch the same file without needing separate versions. When played on a versatile media player like VLC Media Player, MX Player, or KMPlayer , you can simply right-click (or tap the screen) and switch between the English and Hindi tracks on the fly.
When you look for a rip, you are looking for the best source material available. Even when compressed to 400Mb, a BluRay source ensures: