The best advise i can give you is look ahead more.. Lets say you see that traffic light, a couple of hundred feet back you should start downshifting. Until you're slow enough to turn. You should always be in gear whenever you are turning in case you need to accelerate out to miss a car or something. And as for the freeway thing same advise. Downshift to slow down for the turn. My rule of thumb is you can take most turns double the posted speed without losing control. Im not saying do this the first time you hit a turn. But get used to the turn and next time around take it faster.
good luck, be safe