Is there much difference between 1.3 and 2.1?

[eluser]talkingnews[/eluser]
[quote author="CroNiX" date="1330562552"]Kind of like having to ask if there is much difference between 1.3 that was released 6 years ago and current version.[/quote]

Yeah, so I'm saying "why have a reference sheet for 1.3 in the 2.1 docs"?

You're saying "ignore anything you find marked 2.1 documentation, it's not relevant".

So, as a newcomer trying to work through the docs, it's not easy. If I should ignore the documentation, what do I use?