In order to create the best products descriptions you'll have to edit your store settings. 

To do that, go to the "Store" tab. 

Here you'll see all the settings you can edit.

Set the tone you want to use. It depend on your audience, niche etc. But you can choose between 7 tones to see who can fit the best for you.

Then simply choose the language you want to use for your store.

Now, it's a little bit different. 

You'll have to manually type what you want. 

Write a clear and precise description of what you are selling and the type of your audience. 

It can take a little time but it worth it. It will create better product descriptions and more coherent contents.

Now, clic on "Update" to save your new informations!