In the Setup section, we have users install Libreoffice, which sets the assumption that Libreoffice will be used for this lesson. However, in the next episode we say we are assuming the user is using Excel.
Perhaps change this language:
For this lesson, if you don’t have a spreadsheet program already, you can use LibreOffice. It’s a free, open source spreadsheet program.
to something like:
For this lesson, we assume you will be using Excel. If you don’t have Excel, you can use LibreOffice. It’s a free, open source spreadsheet program.