Similar to The Grinder and Submittable, Duotrope will help you learn about creative writing markets and manage your submissions, but it does require a subscription fee.
While Erika Krouse’s blog primarily collects resources for short fiction, it is a fantastic resource to get a sense of various types of publication venues for all genres.
A database that many literary markets use to collect submissions. Creating an account is free though sometimes journals will ask for a submission fee before submitting.
Advice from our faculty...
Since it is important to read contemporary work that is being published, these sites feature daily samples of current poetry: