> I also know absolutely no Chinese/Mandarin (btw are they the same?)
If you see a bare reference to "Chinese", it will be referring to Mandarin.
There are several families of Chinese languages, with the most prominent being:
- 官话 (literally "mandarin speech"; Mandarin belongs to this family)
- 粤语 ("Yue language"; Cantonese belongs to this one)
- 吴语 ("Wu language"; Shanghainese belongs here)
- 闽南语 ("Southern Min language"; Hokkien belongs here)
It's also possible (and routine) to just label a variety of speech with the name of the place where it is spoken. This gives the names of specific dialects rather than broad families:
- 普通话 ("ordinary speech", this is Mandarin. It is conceived of as being an artificial standard rather than being specifically associated with any particular place.)
- 广东话 ("Cantonese", the speech of 广东, which is a large province)
- 上海话 ("Shanghainese", the speech of 上海, which while admittedly a large city is not as large as a province)
- 福建话 ("Hokkien", the speech of 福建, also a large province)
- 北京话 ("Beijingnese", again just a city. This construction applies at pretty much every scope.)
普通话 is the official name of Mandarin, but there are some important synonyms:
- 汉语 ("Han language" - Han is the ethnic term for the Chinese people. As noted, synonymous with Mandarin.)
- 中文 ("Chinese" - here the term is taken from the name of China, 中国. Also synonymous with Mandarin.)