Wellcome, if you want to leave a message, please do it in my Portuguese discussion page and If you do not speak Portuguese... at least try. We try :) This experience was illuminating and helped me a lot to understand the controversy, the lobby and the motivations behind the different Wiki projects. "another brick on the wall" i would say ...
Your sandbox is a place for you to experiment with wikicode, to keep notes, to draft sections to add to articles, or for any other purpose that helps build the encyclopedia. Although your sandbox will usually be left alone by other editors, you do not have 100% control. It can't be used to host copyright violations or personal attacks on people, for example.
Have you ever added an example image to a page, only to have it removed and receive a warning? Here's a solution. If you want to test some unfamiliar wiki-markup, or practice image placement, head to the Sandbox, where you can test to your heart's delight (or you can create your own sandbox for more demanding tests). Or open your own sandbox by clicking on "Sandbox" on your user menu at the top of the screen.
Bonus tip: you can have as many sandboxes as you like, but only one gets displayed at the top of the page. To get to the others easily, you could list their links on your sandbox page, using it as a menu of sandboxes.
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