Do you know how to use spreadsheets? Google Drive is a great tool. It's free and it's very phone friendly. Everything is stored on the internet in one spot so you'll never accidentally overwrite a new file copy on your computer with an old file copy from your phone or vice versa, and it doesn't have to eat up a lot of memory on your phone. You can access and edit it anywhere you can log onto the internet without having to have special software. If you download the app onto your computer or phone, you can also access the files offline. And, it's free. Did I mention it's free?