Create a Grid

Add a row on a page.

Select full-width column (or any column layout)

Click on the Add Module icon.

Select the Divi Loop module.

Edit the module.

First, configure your query to fetch your desired posts.

Now select a skin that you must have created already.

Choose your desired skin layout.

Finally, Select the Grid Layout.

Adjust the Grid options to your needs.

That's it. You get a nice grid of your posts.