A Sandbox is a page that can be used to practice editing, to learn the formatting, and to put together drafts without necessarily publishing it to the main page. As someone who learns by doing (which unfortunately means lots of mistakes), having a sandbox where I can try out code, formatting, and design is very useful.
Creating your own sandbox can be a bit confusing, so here are steps that you can follow to create one like mine!
1. Go to your user page. You can do this by clicking on your username in the top right of any wiki page.
2. Add /Sandbox to the end of your url. Click on the url box in your browser, deselect the text, and type in /Sandbox ant the very end of. Go to this page.
3. If you have not yet created your sandbox, you will have the option to do so here. Right next to the page title, click the Create button.
4. If it opens up in the visual editor, select the option to open the source editor.
5. Paste the following code into the text box:
{{Sandbox}}
<!--EDIT BELOW THIS LINE-->
6. Below this pasted text, you can begin to practice editing. I added a table of contents and links to useful templates and code that I often need to look up.
7. Whenever you are finished editing in the source editor, click Apply Changes on the bottom right of the frame.
8. Click on Publish to save your page.
9. To find your Sandbox easily, add a link to it on your profile page. You can do so by pasting the following code into the source editor of your user page, replacing "Username" with your own username:
[[User:Username/Sandbox|My Sandbox]]
10. Voila! You now have a Sandbox of your own! Experiment with it as you please!