I belong to countless groups via the internet. Quite often you see useful tips and information and it can let you know about any new publishers.It also gives you the advantage of being able to publicise your latest novel.
For many years I have been a member of the Romantic Novelists Association, they have an online group which can be very useful. If you have a query people will often try to solve it for you. They produce a thrice yearly magazine which is interesting. It's good to see pictures of fellow writers in there. This means you can recognise people if you go to a meeting.
I find the Romantic Novelists very kind and supportive, they were wonderful to me when I lost my husband. You can't buy friendship like that. Also they are supportive of new writers and you never get any jealousy or nastiness. Everyone is happy when someone achieves success. I really like that.