When you copy and paste text from documents or websites there are 2 things to be careful with.
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1 • Rewrite your content
You want your site to have original and rich content. You absolutely want to avoid having content that exists elsewhere on the web, even if it is your own. If you have a few sentences and especially an entire chapter that exists already on the web, search engines may consider it as "duplicate content". The risk is that search engines will at best consider your site as a copy, or an uninteresting source of information, and at worst identify your site with content theft and blacklist it.
So, the minimum that you should do is modify and significantly enrich the content you import. It is part of your effort to keep your site original and useful for your readers.
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2 • "Clean" your text before formatting it.
When you copy-paste a piece of text from a Word document or another website, you also copy the formatting within it. The text editor of SimDif will do its best to remove this formatting, but sometimes some HTML snippets will remain in the text. It can then become difficult to bold your text, place a Title, edit a link correctly, ...