None of these messages are critical, they are simply warnings, although they could be indicative of something else going on.
Did you install anything outside of the Software store on your own, using the terminal or perhaps a .deb
package manually? The warnings refer to duplicate entries in your repository list, where updates are downloaded from.
Open the Software store's preferences -> Software Repositories -> Other Software, and take a screenshot. Make sure to maximize the window so that all entries are visible.
The first warning here is expected and completely harmless, but if you want to get rid of it take a look a this other post: