There is a lot of information out there, how to recognize a predatory journal (PJ), so there is no need to build an own list here. Just see the warning signs at instr.iastate.libguides.com/predatory/id or the 25 crits at tressacademic.com/identify-predatory-journals. PJs are big problem now, as they already entered Pubmed and even reputed journals can become a PJ over time. As a basic reference I would use the (outdated) Beall’s list and cross check with Thomson Reuters ISI listing. PJs do not behave like a normal journal – see also the 96 things publishers usually do.