Thought I'd post this here as I've done this course and found it very handy for a number of different techniques, even though I had to drop out of my normal editing program (Premiere Pro) and use Hitfilm Express for the course. Visual Effects for Guerilla Filmmakers is a four week course run by the Norwich University of the Arts. All the lessons and tutorials take place online with a series of easy to follow videos and text instructions. You can share your work with other students/lecturers for feedback. It covers subjects such as motion tracking and compositing, green screen, cloning and masking and even 3D. Best of all it's FREE, as is the software required for the course. futurelearn.com/courses/vfx-for-filmmakers Enjoy!