Different birds like different materials, gold finches line the inside of their nest with thistle down from the thistle flowers that have gone to seed. Chickadees lined the bottom of their nest with moss, hummingbirds use lichen and spider webs to build a nest, robins use mud, grass and string or yarn. Morning doves just used sticks. Wrens used sticks and trash. Some birds love shiny things like wrappers and trash.
Some nests are in trees and some in boxes.
House finches will make a nest right in my hanging baskets got to be careful watering those as to NOT drown the hatchlings. I clean out bird boxes after each brood is raised and leaves the box. We've had several different familys raised in the same box in one summer season. It's fun in the fall after the leaves have fallen off the trees to look at the all the nests and see if we can identify which kind of birds made it and whether they used any material from our yard to make it. Been working on my wildlife garden about 10 years now.