Uploading files to Google Drive
Full instructions here:
The maximum file size for an upload is 5 TB. However, once you have uploaded more than 750 GB in a day, you cannot upload any further files that day. (So if you upload a 1 TB file, you'll be able to upload the whole thing, but you won't be able to upload any further files that day.)
In the browser
You can just drag and drop files into your drive to upload them directly.
Or you can click "New" in the top-left and select "File upload" or "Folder upload", then navigate to what you want to upload.
In the app
If you have the Google Drive app on your computer (https://support.google.com/drive/answer/2374987/back-up-amp-sync-files-with-google-drive-computer) then there will be a Google Drive folder on your computer.
Any files you move into this folder will be automatically uploaded to Google Drive, and vice versa.