Once an article submitted for publication is rejected can I send it to another journal? If so, what are good criteria and tips for doing that?
Yes, one you've been rejected, you can submit elsewhere.
The best way to proceed is to take the feedback you got in the rejection letter seriously, which will usually lead to one of two actions:
- If you got an editorial rejection without review due to problems in scope or significance, then pick a better suited journal (usually more narrowly focused on your area).
- If you got a rejection with review, then improve the article to address the objections of the reviewers.
Good luck, and know that even good research can sometimes spend years in the cycle before it finally is sufficiently well improved and targeted that it can find a good home.