MapReduce. Google has now fully stopped using MapReduce. Don’t worry, it doesn’t impact the search results, says John Mueller of Google.
Webmaster video hangouts. John Mueller routinely does Google webmaster hangouts. Check out the schedule.
Don’t use m-dots. Google’s John Mueller strongly recommends avoiding m-dot domains, especially for new domains.
Snippets and interstitials. Gary Illyes from Google says watch out with those interstitials. Having them might impact your snippets.