How to follow specific journal or conference in google scholar for new paper? I want to follow few journal and conference. IS it possible to create alert for such specific item in google scholar? or is there any other system available for these kind of tasks?
Many conferences and journals have RSS feeds that you can aggregate with an RSS reader. Usually they are linked on the conference / journal website (though sometimes you need to search for "rss" in the page source because it is hidden somewhere).

Example: the arXiv math.AG site doesn't mention RSS anywhere, but the page source does.