Because the Promotional Video had to be only 1 minute, I had to cut quarters from the clips, because my original length was 3 minutes. I had some problems with the audio as well, because the movie's audio was forward and I had to move it 2 seconds to the left side.
As a conclusion I can say that from all of the editing I have done for the past 3 months, I learned a lot and I hope that with these knowledge I will be able to develop many more projects like this.