>> Do you have a reference where I can learn about this? > I don't really understand what you're asking for. That comes across as rude and condescending; ple

>> Do you have a reference where I can learn about this? > I don't really understand what you're asking for. That comes across as rude and condescending; please don't communicate like that. Your English skills seem OK but in case you still need help, they're asking for a "reference" -- that's an online source of some sort probably, where they can "learn about" it -- that means that the reference would contain content helping them to understand the topic better. For example, the helpful content you gave after your rude and condescending initial comment would be an example of such content.