How do you look after an orchid?

That is totally dependent on the species of Orchid. Some like hot, some like cool, some like full sun, some prefer some shade, etc... When buying one, know exactly where you will be putting it and match what you buy to the conditions in that location. Don't buy a cool, shade loving species and put it in a hot window with full sun exposure. For information about the different species and their cultureal requirements you can read culture sheets for them here http://www.orchidweb.com/cultural.htm

How do you look after an orchid?
not too much sun, just the right amount of fertilizer and water and it is best to plant it with some charcoals and in a coconut husk :-)