Answer:
Hi,
If you are using an article, novel, essay, ect.., as long as you paraphrase and cite your work, you can usually avoid accidentally plagiarizing.
In general, there are tools that check if you are plagiarizing something if you would like. Try to make your writing sound like yourself, not someone else's.
Do not take someone's work without citing!!! This is very important. Always read over your work to make sure it makes complete sense and is not too similair to the original!
Note that these are several tips, not one. Whichever one you think is most important, use!
Hope this helps! (: