I am writing a non-fiction book and I notice that in some books I am reading on the same subject, has similar 'information'. Not all but some. But, I am writing it differently and I have gone into further detail with particular things, plus I aim for it to be a different target audience. But, is it okay to include similar concepts in the book? For example, I could be writing about how to cook chocolate cakes and another author, or multiple authors have written the same sort of thing but differently.