Assembling a Rough Cut

To edit a clip between two existing clips, which edit function would you use?

If a clip or timeline name is displayed in red above a viewer, what does that mean?

This is the active viewer. Among other things, playback keybaord shortcuts will work with this viewer.
There is an error, this viewer cannot play the clip.
The media for the displayed clip or timeline is unlinked.
Red idicates that this is the timeline viewer. The source viewer uses white labels.

What happens if you press and hold the K and J keys together?

Typing a positive number (+) will move the playhead to the left, toward the start of the timeline.

How can you simultaneously move multiple clips from the bin and insert them into the timeline?

Select the clips and drag them into the timeline viwer and use the edit overlay to select any editing function.
Select the clips and drag & drop them directly into the timeline
You cannot move multiple clips into the timeline at the same time. Take one clip at a time.
Select the clips, right-click, choose one of the insert options or Append option from the context menu.