You can build a simple arrangement of images by using a table. Take a look at this example to get ideas about how this might look: I'm using the vertical listing class with 2 rows and 4 columns

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In all the examples you've seen in the tutorial, you should be able to copy and paste one of the tables from this page into a Plone page you are working on. That way you can manipulate a pre-existing table for practice. If you're feeling really brave you can also view the HTML that makes up a table!