We can not insert 3d Model in document but image, shape and video can be insert in document.
Mail merge lets you create a batch of documents that are personalized for each recipient.
Home Key is used to jump to the beginning of line where Ctrl + Home is used to Beginning of the document.
In LibreOffice Writer, the shortcut key used to break a line is Shift + Enter. Pressing Shift + Enter creates a line break without starting a new paragraph. This allows you to continue typing on a new line within the same paragraph. If you want to start a new paragraph, you can simply press Enter.