A plugin FIFU(Featured Image from URL) is highly recommended. Using this plugin, you can save about 30G hosting space and import all products within minutes.

Otherwise woocommerce itself will generate several thumbnails for each image, which will fill up your hosting space. And import speed is very slow due to thumbnail generation.

(Just search FIFU in wordpress plugin page)

How to import our csv file

Sometimes you will need to delete products/categories before updating new series. (We will give notice when you need to delete the category.)

Here is the tutorial of how to bulk detele them.

https://drive.google.com/file/d/1P5hFmoHxs-kh6Axv4WVUsV6ON23tR79V/view?usp=sharing