I did trim a video today in imovie, but very confusing. The video I imported when to a list on left called events and I renamed it and it is now gone.

The second video I brought in I don't see in the timeline below, but instead in the timeline is the old video, I'm don't with, and that is very confusing.

Also , why is the video called event and not Movie? To confuse more. I do see My movie icon in upper left. What is that?

Lastly, The movie library is empty now even though I've uploaded two videos. Total mess/ chaos of an interface, thanks for help. Appreciated!

There are a number of free tutorials available for iMovie from Apple and a variety of other sources. I suggest starting with Apple's.

Thanks Joe.