How do I get to know research areas in Physics and Mathematics? I posted this on the Physics Site and I was warned that I would be best fit here.

I'm a freshman undergrad and I plan to get a Physics major. I don't know actually in what area I want to follow, I do have an idea that I don't want to be and Experimental Physicist but I'm open to every experience. I know many universities offer their colloquium/talk on the Internet which most of the times I find very interesting and informative, but I find it hard to get to know many good colloquia. I will be very glad if you can recommend me anything that would help me to understand the research fields in Physics and Mathematics.
While I agree with Coder's comment that this is probably off-topic here, perhaps I can provide a general answer which would apply to users looking into any new discipline, not just physics or math.

In order to really come to terms with any field, I would recommend the following (in no particular order):


Take relevant classes. As an undergrad, this should be extremely easy.
Talk to people currently performing research in these fields. This can include your professors or perhaps emailing researchers whose work you've seen and been interested in. This is the option I would suggest most, as you're likely to get a wider array of viewpoints.
As Coder mentioned in the comments, go check out some of the recent research papers in your field's top conferences. You'll likely be unable to follow the majority of the work, but you should be able to get a good feel for the general tone of research being done in the field.
Per Carol: Attend the colloquia and seminars that the relevant departments host.