Changing the area of a post

Hi,

I’m new to wordpress. I love spun and want it to remain responsive. Hopefully this is the right place to ask this?
Is there anyway to change the size of the post area so that pictures in a post fit the full width of the browser?

I there anyway to take out the post titles (when viewing the post not the homescreen) and remove that extra white space?

Thanks for any help you can give! I hope this is the right place to ask this.