What lens does Canon 400D match?

It is not easy to choose this. Your first and third items are used to shoot scenery, so focus on this one. I suggest you buy the 10-22MM wide-angle lens from the vice factory. More than 3000 shots can come down. If you are on the stage, it will be more expensive to use telephoto. You can buy a 55-250 F3.5-5.6 Canon lens, which is less than 2000 yuan and has a large aperture.