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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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:
@RayLuo From what I saw on http://stackexchange.com/filters, you can add several filters to subscribe to multiple tags. See the screenshot: