All of that is correct. 10nF and 100nF for film. They may be labeled with pF or uF also (1n = 1000p = .001u)
Generally, large values of caps (roughly, uF and up) will be electros (or tantalum, though I never put tantalum in the signal path, only use it for power filtering). Mid-values (roughly, nF) are film, and pF are ceramic).
This just describes what's generally available. You can usually use whatever cap has the right value, physical size, and polarity. They don't generally sound different to me, but some people claim they can hear a difference. This topic can quickly turn into a
religious war, so I will stop here, other than to say that the value is what's important in the circuit, not the material.