A. Double click to select the Item wich you captured or imported and be prepared to log the footage that you used and do not leave out any imported infomation that is used within edit including transitions.

Q. Is there anything I can do to make myself more proficient in video editing?
A. Set aside time whenever you can to checkout what your tools do, check your editing skills, or just opening a projectyou may make a mistake or do not want it in your project, no problem, just select what you do not want and undo it you can not hurt your project, but always remember to undo the selected item after trial.

Q. Can I add audio or sound effects to my iMovie?
A. Yes, in many cases this is recommended