I would say this sub is probably not the best for Pi. Depending on what software you are going to be running then the appropriate sub would be that given software sub. So if you plan on running WeeWx for example then you'd visit the WeeWx sub. If you need general Pi support and more Linux general knowledge then I'd probably visit some other website forums. For example if you need help with Raspbian then you be best to visit its online resources.