If you enter my website from your phone and pull the site to left or right, you will see the background part of the site. That is it is wider than it should be, which is a issue of GP.
Issue 1
will be related to the spacing you have between any clickable element. So increasing line heights and widths on navigation elements and links, increase gutters between post blocks etc.
Issue 2
The only content extending beyond the screen container is the Advert Banner. Its not ‘very’ responsive. You may need to seek help from the ad service provider.