In Microsoft Word, you can insert two types of tables into your documents: a plain text-only table or an embedded full-featured Excel table:
LibreOffice Writer has the equivalent of the plain-text table:
but I don’t see any way to insert a full-featured Calc table. I know it’s possible for them to be embedded, since I can open a .doc file with embedded Excel table and Writer treats it as an embedded Calc table, but I don’t know how to create a blank Calc table inside a Writer document.