That is a vast subject. With sometimes vast prices, both for the tea and for the teapots.
You can get the disc-shaped compressed Pu'er they call 茶餅 cha bing and also black teas more strongly compressed into rectangular bricks, a process that goes back hundreds of years.
Many Chinese teas are like fine wines, you can only appreciate the nuances with lots of practice and I don't get much Chinese tea these days. Also the process to make a cup of tea can be complex. Not in the way of the Japanese Tea Ceremony, which is first and foremost about the ceremony, the different Chinese teas require different equipment simply to make a good cup of tea.
I rather like the green, high mountain teas from Taiwan. Very fragrant, when prepared by someone who knows what they are doing, which is someone other than myself.