If you have a map layer and want to share the attribute table with someone else as a spreadsheet (e.g. because they aren't a GIS user) then you can easily export to csv or xlsx format in QGIS. This video shows you how quick and easy it is - and you can even choose which columns you want to include or exclude.
See my intro and intermediate QGIS courses for more: https://www.udemy.com/user/alasdair-r...