Using both of your brakes is perfectly fine, I did it all the time on the street. You can use your front brake in a corner but you have to be extremely gentle and this is a more advanced skill. On a longer sweeping high speed corner it will actually try and stand the bike upright when you apply the front brake. If you apply too much you'll end up with a face full of asphalt. Entering a corner while applying the front brake is what's known as "trail braking" and trying to do this on the road with less than ideal conditions could result in a lowside.
OK, thanks for post and explaining trail breaking..
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