For most SketchUp models, the unit of measurement you use is critical to the success of your final project. In SketchUp you can control what units of measurement are used for each model you create. Units and Precision in Model InfoIn Model Info you can view and change the units of measurement in your model. To access these settings, open Model Info by selecting Window > Model Info and select Units from the options on the left. 

Can you imagine Johannes Gutenberg, inventor of the printing press, learning how to create 3D models in SketchUp? Hopefully, he’d like the way SketchUp advances his groundbreaking invention - especially the text that moves and (in some cases) updates as you work on your model.In SketchUp, you can add four types of text, each depicted in the following figure: