This video on Charting Essentials provides some valuable information and shortcuts that all Investor/RT users should be aware of.
This video on Indicator Essentials is also very valuable when getting started with Investor/RT.
One concept that was not covered in that video because it was not available, but is very important, is the concept of Chart Trading Hours (Day Session and Full Session). The Trading Hours window can be accessed by right-clicking in chart and choosing "Setup > Trading Hours" or simply click on the chart and hit the comma key on keyboard. Proper setup of day and full session for each symbol is now very easy, but also increasingly important as more and more Investor/RT components rely on proper setup. This video on Chart Hours Overview explains this concept in more detail