You may sometimes notice that when you try to sign in to your Chromebook, or when you are just typing normally into a website or Google Doc, that some of the keys do not respond, or may type the wrong character.
This is caused by the default keyboard being set to the wrong layout. When you look at the bottom-right side of the screen, you may see the letters "ES". That is telling you that the keyboard is currently set to Spanish layout.
If you click on the "ES", you can change the default keyboard back to "US". That will resolve the issue you are seeing.