First look for a journal in your area through databases (Scopus, WOS, EBSCO, DOAJ, etc.) and there should be pages on information for authors. There will be templates, guidelines, policies, instructions for each journal.
You will find 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
https://www.researchgate.net/post/How-to-publish-a-research-paper/1
If you mean to publish with ResearchGate: Please note that RG is neither a journal nor a publisher, 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 It is a platform for papers published in journals, or to present unpublished texts, data etc.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.
If you mean how to add a published paper to your RG profile, see https://help.researchgate.net/hc/en-us/articles/14293005132305-How-to-add-research for instructions.
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