Todo App using ReactJs

This was my first project using react to build out the site, I learned a lot about JavaScript and utilizing the map and filter functions and how to structure a web app using components. The biggest struggle I encountered was preserving the data of the array after applying a filter. Any feedback is appreciated. I'm very new to using react so I'm sure there are much better ways to doing this then what i've done. I'm just happy I was able to get a working todo app.