Hi Britney-
That “jagged edge” is a part of the Resolve theme, but you can remove it with a little bit of Custom CSS.
Navigate to Customize > Advanced > Custom JS & CSS and paste this code into the Custom Theme CSS field:
div.background-accent {display: none;}
div.entry-content { margin-top: 0 !important; padding-top: 0 !important; }
That will resolve issues 1 and 2. For issue 3, add one more line:
.mod-space-home { margin-top: 10%; }
That will reduce the space underneath your call to action. You can adjust the 10% value to suit your needs. Right now, it’s 25%. If you want to get rid of the extra space entirely, you can change it to 0.