Full Tutorial for Shotcut program

Hello,
Where can I find a full tutorial / help to work with Shotcut program, all I am doing now is trial and error, most of the time error.
The first video on tutorial page cannot be opened - restricted.
First what I want to do is how to remove commercials from video at both ends, or in the middle.
Answers will be appreciated.
Thanks
Motim

See the Tutorials page on the web site. In fact, there is even a menu item in the Help menu for this within Shotcut. Not enough? Buy the official video tutorial course. Not enough? See the playlists on our YouTube channel or search YouTube.

Hello,
Thanks for the answer.
Followed some tutorial-videos, made my first test. It was a downloaded clip, with commercials on both ends. Tried to remove those commercials - they both gone, but at the end of the clip there is a black screen with “freemake.com” on it and some icon. So from one commercial got another one. Is there a way to remove it ?
Answers will be appreciated
Thanks
Motim

That wasn’t added by Shotcut, it would have been in the original video, so remove it the same way you removed the other bits.