DSF

Hi Guys , just trying to figure out how people are uploading so many new products to sites lie ebay and amazon, is it the csv files? is it much quicker i had a quick look into it but im terrible with excel, is it worth doing a little course to help perhaps?
just any general advice please

Plenty of software available to help with listings, creating, maintaining, re-adding to sites etc. I haven't used any in a few years so someone else will no doubt be able to advise which are currently the best.