I'd like to ask some questions about IT contracting, but I thought it would be worth checking to see if they are on-topic at Freelancing. I can't see that this has specifically been asked on the Meta site yet.
In case the word means things in different regions, by "contracting" I mean a fixed-duration working relationship set up between a worker and a client, often with a recruiter arranging the introduction, and with no permanent employment benefits offered.
Contractors work on a daily rate rather than on a fixed/project cost basis, and - at least here in the UK - tend to set up a limited company rather than as a self tax-assessing sole trader. Contractors work only at one company at once, and usually on-site, but still regard themselves as self-employed.
Questions relating to contracting might include how to deal with recruitment agencies, contractual terms that one sets up with recruiters, as well as how to choose and set up country-specific company vehicles for the purposes of paying wages and taxation.