Reviewing and experimenting with example projects is another great way to learn. There are hundreds of them available right in Xojo. You can access them in Xojo by choosing File > New Project and then clicking on Examples in the New Project window.
The examples in this dialog box are loaded via the Internet. If you need access to them when you're not connected to the Internet, you can download them.
While most examples are designed to show off a specific feature, the Eddie's Electronic's example project is a full application.