Here's a really good introduction to inheritance: https://www.youtube.com/watch?v=PMfcsYzj-9M https://www.youtube.com/watch?v=PMfcsYzj-9M -- a lot of people str

Here's a really good introduction to inheritance: https://www.youtube.com/watch?v=PMfcsYzj-9M https://www.youtube.com/watch?v=PMfcsYzj-9M -- a lot of people struggle unless they have a good understanding of how this works. Also, Douglass Crockford (the person who wrote "JavaScript: The Good Parts") has a number of videos that are very useful. Here's the first in a series of eight: https://www.youtube.com/watch?v=JxAXlJEmNMg https://www.youtube.com/watch?v=JxAXlJEmNMg -- and if you find that useful, you can check out the rest in the list of related videos.