As an author, you will have certain ethical obligations as part of the scholarly communication process, whether you intend publishing a paper in a journal, writing a book or presenting your work in person at a conference, on the internet or via social media.
Many journals as part of their electronic submission processes, will run your papers via anti plagiarism software e.g. iThenticate, before passing papers through to reviewing editors. An iTenthicate survey identified the main types of plagiarism occurring in research.
You may also wish to consider the issues surrounding self plagiarism. ie submitting multiple versions of nearly the same paper to different journals or re-using entire sections from earlier papers, in essence "text recycling".
When submitting a paper, do not submit it to more than one journal at a time . Should you choose not to wait for the final decision on a paper, withdraw your paper and submit it to another journal at that point – not before.