Q.What is the difference between News and Blog?
News and Blog, accessible in your Shop Manager from Contents → News and Contents → Blog respectively, are two different functions for creating chronologically-ordered text posts on your website.
The functionality between Blog and News is functionally identical. The way many people use these functions is to use News to give your customers regular updates on what's going on in your store—information on sales, new items, et cetera— but to use the Blog to give more personal information to let your customers get to know you better, such as your recent trips, things you've learned, advice, and so on.
However, these functions can both be used however you want. If desired, they can be renamed at Design → Page titles.