When learning a new language or concept in programming, it might be useful to follow all the new questions that are posted on StackOverflow related to that concept. All questions on StackOverflow are nicely tagged, so the concept you want to follow can be tracked easily. One way to track all new questions on a certain tag is to get email notifications when that happens.
To be able to do this, visit the StackOverflow tags page. Find the tag you want and hover your mouse pointer over the tag. A overlay window pops up. Choose Subscribe here to get email notifications.
The email notifications are handled from a central StackExchange service. The email notification frequency is once per day by default. This can be changed to either once every 3 hours or every 15 minutes.