Google Docs or these days Google Drive can make collaborating with your colleagues or friends much easier by sharing Google Document, Spreadsheet, Presentation, Pictures or a whole folder.
If you don't want websites tracking you, and you don't want the pages you view to be saved in browse or search history, you need to active the incognito mode and this is what you need to do.
You don't need an open fire to roast chestnuts, you can roast them in a comfort of your own home over a kitchen hob and they will end up just as delicious.