For those using the desktop version, you can install Drive for desktop to open files directly in your computer's native applications.
If you are looking for an "informative article" on how to manage your Drive, the following resources are highly relevant for that date: 29-jan - Google Drive
If you are on a phone, you can upload files to Drive by tapping the "+" icon and selecting "Upload." For those using the desktop version, you can
You can instantly check your storage usage by clicking "Storage" on the left-hand menu in Drive; this automatically sorts your files from largest to smallest. For those using the desktop version