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FAQ: We need some best practices for ADC usage
One permanently reoccuring source for confusion is the difference between Arduino ADCs and Particle's. Not only the difference in resolution (12bit vs. 10bit) but also the lack of a Vref pin (Gen1 & Gen2) but even more the electronic differences regarding input impedance, lack of buffered/driven inputs, ...
Things to address might be when and why to use input/filter/decoupling caps, pull-resistors, impedance converters/buffers, ...
Good idea! Also explain how the sample time works. I'll add it to my list.