What version of Jquery should I be using?

What version of Jquery should I be using?

Hi

I am new to Jquery and I am unsure what version of Jquery should I be using.

I see 3 versions and I really don't know what the differences are to each one.

jQuery 1.2.6 (16kb, Minified and Gzipped)

- good for production enviroment

jQuery 1.2.6 (97kb, Uncompressed) Great for testing, learning and development.

jQuery 1.2.6 (30kb, Packed) For those that can't Gzip their JavaScript.

So other then that little description I really don't understand what the difference is for each one. Like what are the advantages to each one? How is the 97KB one better for learning then the Gzipped one.

if I use the gzipped one do I have to extract it out to make changes then gzip it backup or how does this all work?

thanks