We are all short of money so i was thinking about a site where you could trade a skill for another skill.
For example: suppose i want new taps fitted on my sink, someone could do that for me and i could paint a ceiling for them, or babysit for the evening, so it would be like a favor for a favor.

Empathy66, trading services is a great idea. I once worked in a restaurant that had a barter jar on the cash register counter. People could drop in their business cards and take out the business cards of other people who wanted to trade services, as for example, a bookkeeper who wanted to trade his or her skills for printed advertising space in a weekly paper.

Any other ideas for what to do with a website?

Later, we'll discuss how to actually go about having your own website(s), if that's something you might want to do. Right now, let's just explore some of the uses you might have for a website. For example, you can use a website to organize people for religious, social, or political purposes. You can use a website to sell goods and services. You can use a website to connect with your family, to post your family genealogy, to communicate with members of your neighborhood watch group, to post your poetry or writings, to advertise your dog walking service, to sell your handmade art or jewelry, to help lonely people living in cities meet people, to exchange recipes, and so on.