<p>It’s pretty hard to injure yourself. I’ve been weight lifting for over 6 years, including stretches of powerlifting every now and then and I’ve never had a serious injury. I’ve had tendonitis in my shoulder a few times, I’ve had runner’s knee, and sore knees from deadlifting. That’s about it.</p>
<p>exrx.net has decent instructions for common exercises</p>