Copy and Past only way?

I am new on eCommerce and just installed Woocommerce on my site. Now I like to add some items for sale from the sources that I found online for sale. By the way at the moment I am just trying to do dropshipping (because of my budget). The question is how can I add multi or bulk items to my site? I don't this copy and past its only option because it takes time and lots of work to do one by one.
Thanks everyone for help

Poster :