how to upload whole folders to Google drive

I wish to upload whole folders to Google Drive in as quick and efficient manner as possible. Some of these folders contain subfolders which in turn contain files. The files are photos, music, pdfs, documents etc. The size of the folders is considerable - several GBs each.

I have plenty of room on Drive (100GB) for this purpose. When I look on the internet for info it only yields explanations about how to upload a limited number of files.

Grateful for any advice.

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