If you're an early career mathematician (perhaps a grad student or postdoc), one of your challenges may be figuring out where to submit a paper for publication. While there are tools that can help, your first step will generally be talking to people: your advisor, a mentor, or others working in your subfield.
Beyond general advice for likely target journals, these folks may be also able to identify journals who have editors with the experience to evaluate your specific topic.
Once you've talked to trusted humans, it's also good to research the journals you're interested in submitted to.
To figure out if a journal is a legitimate one, there are a number of steps you can take.
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