Communities are all around us. We're part of many communities, whether they're communities made up of family, friends, or shared interests. And "moo" is an online community that investors gather around.
So when do you use the community function in moomoo app? What pushes you to meet other mooers online? Is it because of loneliness or something else? 
(I mean this one here)

to be honest I don't really know

how do I pick stock for the puzzle thing