Here is a summary of the keys introduced in this lesson. Be sure you know each of these.
i = In Point - define the start of your clip
o = Out Point - define the end of your clip
Ctrl d = duration, change the length of your selected clip
e = Append the selected clip to your timeline, add it to the end of the previous clip in the timeline.
w = Insert the selected clip at the point of the playhead.
Up arrow and Down arrow = move to the beginning or end of a clip in the timeline.
Home key - move to the start of the timeline