Does this look like a good curriculum?

I've been learning java for about 2 months now, and a friend recommended this series to me. They said that it was important to watch before getting to far into any language before bad habits are set in. Has anybody here also heard of and/or seen this series? Can have a look at the description of the classes and let me know if if the curriculum looks good? Thanks!

http://www.extension.harvard.edu/open-learning-initiative/introduction-computer-science

why is java hard to unlearn, and why would you want to do so?

This is the first time I am hearing that java is difficult to "unlearn" and the first time I have been encouraged to start over.

And why does brainfuck even exist? Was it's sole purpose to make a language almost as heard to read as binary? Fuck