need info about dc-dc boost converter
A1: I'm... honestly not sure what is meant by dropout voltage in the context of a switching power supply, especially not a boost regulator. Dropout voltage is the difference between the minimum input voltage and the maximum output voltage of a linear (i.e. not switching) regulator. I can only guess they're sticking technical-sounding words in there. (low dropout voltage is desirable in linear regulators, so it's maybe a bit of a buzzword?)

A2: Quiescent current is the current that the regulator draws when there is no load applied to it. It's the current it takes when it's not doing anything, hence the analogy to being quiet.

A3: Not familiar with this term, unfortunately. A google search reveals no useful results. I kind of suspect technobabble.

A4: ... I think that's poorly translated as well. It seems to be saying something about requiring at least 8V input voltage, but it's such a garbled mess that it's hard to follow.

A5: Almost certainly no. Boost converters and buck converters are not interchangeable without adjusting the circuitry, in general.

A6: Without more information on the circuit, I couldn't tell you what that potentiometer is there for. Leave a comment if anyone has any ideas.

A7: This will also probably need more information on the circuit. CC makes me think "constant current", maybe?

A8: This question should probably be a separate question; it's not related to any of the others here, and I don't have an answer for it anyway. I'll leave it for someone else to answer.

Long story short, try to get your components from more reputable sources, where you can actually get good documentation. Digikey, Mouser, Newark, any of those are good sources. eBay and Amazon are not generally the place to go for electronic components.