There is nothing – absolutely nothing – like a writers' group to help you improve your writing. The right writers' group can be your friends, the kind of friends who tell you when your fly is open, instead of leaving you out there to realize it yourself. They will delight you, anger you, astonish you, irritate you, and make you laugh.
The wrong writers' group is probably worse than going it alone.
Can I count the ways?
Go to a conference, either on writing, or on science fiction, mysteries, romances. Ask around for a writers' group there. Look at their bulletin board.
Check out your local colleges and community colleges. Call libraries.
And especially, check the Web. Search for "writers' groups" or "writers' workshops." Limit by place, if you like.
What do you write? If you have a focus, there's probably a writers' group to fit it. For instance, if you go to here,you will find the website for the Society of Children's Book Writers and Illustrators. They have an especially good, easy-to-follow site (must be all that writing for children!), and you can check out your local region, to see where and when meetings are held, and whom to contact about them. Science fiction writers, romance writers, mystery writers, all have websites, and often mention writers' groups. Go to the homepage of this site to find some useful links (in the section labeled, "Useful Links," of course.)
I have a possibly sexist remark here. It's my impression that groups which are mostly female, tend to be a bit gentler in their critiques than groups that are more heavily weighted with males. All groups have the rule that you don't attack the writer, only the work; but it's the men who seem to need that rule, for the most part. And heavily female groups often have a rule that you start by saying something nice. But "something nice" can be a complete waste of time.
The danger with gentler critiques is that they stop too soon; they don't tell you the important bad news. The danger with harsher ones is that they discourage you by not telling you the good news.
Writers' groups are a bit like counselors,in that you have to hunt for the one that's right for you. Sometimes it takes a few tries. Don't give up. You have to slosh a lot of pans of dirt before you find the gold nugget.
The poster is from Despair, Inc., but the picture of Hadrian's Wall is by William F. Kale.