There are several strategies for identifying appropriate journals for your article submission.
1. Magazines for Libraries: Gelman Reference (2nd floor) PN 4832 .K2 25th ed.
5. Search for your topic in library databases. Use the facets to see which journals contain the most relevant articles.
6. Google Scholar Journal Metrics. Browse by category and subcategory.
7. Jane: Journal/Author Name Estimator: Enter the title and/or abstract of your paper and click on "Find Journals," Find Authors," or "Find Articles". Jane will compare your document to millions of documents in PubMed to find the best matching journals, authors, or articles.
Beware the predatory journal! Some unscrupulous groups take advantage of novice researchers by making it easy to submit papers for publication. However, these journals may not be using best practices such as peer review, or even strong editorial practices. They may not have a good reputation among researchers in the field, and they may charge high Article Processing Charges which aren't disclosed up front.
Beall's List of Predatory Journals and Publishers is no longer maintained. This link takes you to an archived version.
This blog post from Publons highlights some other ways to spot predatory journals.
Open-access (OA) literature is digital, online, free of charge, and free of most copyright and licensing restrictions. What makes it possible is the internet and the consent of the author or copyright-holder.
-- Peter Suber