IgorBeg has already made many useful videotutorials with explanations in English. Now he has brought together all the HowTo's and makes them available to anyone interested. I recommend you to look at his site because many nice things. In addition there is now a section on Cinelerra-GG Infinity where you can find all its tutorials. The tutorials are on advanced topics and covered in depth; their usefulness is really high for those who want to learn how to use Cinelerra-GG. I recommend downloading the videos locally so you don't have problems slowing down.
Website: http://www.visi1.org/index.html
videotutorials: http://www.visi1.org/cinelerra-gg_tutorials.html
Thank you Andrea for pointing these out. If IgorBeg reads this, is it OK to add the cinelerra tutorials html reference to Settings->Preferences, About in the message text after the Manual reference?