Copying the npm command "npm install –D redux-devtools-extension" from chapter 3.4 (p.51) contains wrong dash:

Unhandled rejection Error: Invalid tag name "–D": Tags may not have any characters that encodeURIComponent encodes.

Simple to fix, but maybe some auto format issue.

Thanks for pointing that out. We'll get the formatting right for the next update.

Same goes for "npm install –P react-redux"