I recently stumbled across codeacademy as well as other free coding websites who's approach to teaching I really enjoy(more interactive and quiz based). I was just doing their HTML tutorials but soon I noticed that it was "old code". The reason I noticed this is because I had also been reading in parallel "HTML & CSS design and build websites". This book teaches you HTML and CSS while trying to push the reader in the direction of HTML5. It does this by making notes of where old code is being used and let's the reader know how it is now implemented in the new standard.
Do you think it would greatly impact me if I went through those tutorials and then moved on to the newer material? If so, is there "interactive" material you could suggest for these? This applies to all programming languages and programming topics in general but at the moment the most relative topics for me would be:
-Python(I have Dive into Python 3, but no interactive material)
-HTML & CSS (I have HTML & CSS design and build websites)
-OpenGL(I have nothing)
Thanks for the help as always!