How do I subscribe to the tags that I am interested in?
I like to get notified via email or so, when someone asks new questions or if someone responds to my questions.
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Mouse over the tag and you will see links to subscribe via email or RSS:
To subscribe to answers in one of your questions, there's a form at the bottom of the "Ask Question" page where you can request that:
In addition to what Anna correctly noted, you can also subscribe to a group of tags as a "Tag Filter" at http://stackexchange.com/filters
For an overview, see: