This is a comparison of four default WordPress themes, twentyeleven, twentytwelve, twentythirteen, twentyfourteen – how they are different, and how they are surprisingly alike; followed by some talk about child themes.
CONTENTS (scroll down in the Themes category, or skip to the post)
01) Installed Files
02) Theme 2011
03) Theme 2012
04) Theme 2013
05) Theme 2014
06) Responsive Media
07) Four Home Pages
08) Theme Files for Home Pages
09) CSS Selectors
10) Post Styles
11) Child Themes
12) Options
14) More Information