How to select a beginning selection and ending selection, and then HOW to crop out this selected section OR HOW to edit where the video STARTS at a point LATER THAN the original start point?
While the video is in the Source tab press I to select the start point and O to select the end point.
I suppose your asking to take out that selected section. Well, you can take that clip in the Source tap that you set the start and end points and drag it to the timeline.
You really should go to the Tutorials section of the website and watch those videos. Click on the top of the page where you see the word โTutorialsโ and it will take you directly to a set of videos to get you to understand the basics.