As a beginner, it’s very frustrating when the suppliers own tutorials are completely and utterly incorrect! Please check them. For instance, the temp and humidity module wiki page clearly shows you connected to A0 and also instructs you to connect the sensor to A0. It is of course a digital sernsor that given the code example should be connected to D2 on the grove shield! I found issues with the dust sensor wiki page as well.
No wonder you get some many issues with beginners not able to get your sensors to work!