Try the Cube Wiki for tips on using the engine.

The layout of a map is among the most important parts of a winning design, try making sure exotic geometry is removed or clipped and the level is open and free of dead-ends or unexplained phenomena.

If your node is not in the right place, it makes it harder for others to find. A node also is a formal presentation of your work, and allows users to review your work before downloading. It is important your content is presented nicely if you would like people to review it and download it. Refer to the User's Guide for tips on how to fix this.

Refer to the Packaging Guide for information on how to fix this.

Screenshots let people get a feel for your work, and is the most important part of a node. They should be the correct size, and have no heads up display elements. Refer to the User's Guide for information on how to fix this.