i like to learn brunei language

Brunei language is pretty much alike with Malaysian language, however some words might bear different meanings in certain context in both Malaysian and Bruneian. I think local sites do provide modules to learn it, but for formal and business purposes, they use the formal bahasa Melayu, and for informal, they will use their dialects. So it depends on which language you want to learn. Maybe you can try find websites of their online radio stations that might offer online guides for you to learn the language. Good luck!