There are many great sites with intros to Linux. Just google something like "linux tutorial". I liked the site www.linuxbasics.org. There is a more or less permanent Linux class going there.

You can't port absolutely anything to the tablet, because it has fewer resources than your Desktop computer. But lots of things can be ported. My impression is that porting a program to the N800 is not something that someone who wants an intro to Linux can do. People here are very responsive, though, so you might be able to interest someone in helping to port your favorite program, unless it is very tricky to do so.

I personally wouldn't use my N800 for professional level writing or editing. The screen is small, etc. Trivial, quick editing -- sure.

It's a great device, but I think some people try to overpress it into something it's not and get angry at it for not fulfilling their fantasies. It probably has many capabilities that you haven't even thought of. Explore the things it does well rather than waste a lot of effort trying to get it to do things that it or you aren't quite ready for.