Each journal has its own guidelines. Visit the homepage of the journal and look for instructions for authors. See also the recommendations in these discussions:
https://www.researchgate.net/post/What_are_the_procedures_for_publishing_a_research_paper/1
https://www.researchgate.net/post/For_publishing_article_in_any_journal_which_necessary_steps_should_be_taken_care_by_a_new_researcher/1
If you mean to publish an article with ResearchGate, note that RG is not a publisher or journal, you cannot "publish" a paper here. It is a platform for papers published in journals, or to present unpublished texts, data etc. See also "Is ResearchGate a publisher?" in https://help.researchgate.net/hc/en-us/articles/14292596164753. See this help page ("How to add research") for instructions how to add published or unpublished research to ResearchGate: https://help.researchgate.net/hc/en-us/articles/14293005132305
every journal and even blogs have their own set of guidelines, do go through them. in case they don't specify anything, you can use Times New Roman as the font, size 12, 1.5 line spacing and justified alignment. APA/MLA references work. this is the basic format.
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