Yes, all very well said, it is important to familiarize yourself with a routine that includes rest, nutrition, and setting realistic limits, especially where ligaments and tendons are concerned, such as the lower legs. And remember to stretch adequately before any exercise in order to let the muscles know to be relaxed and therefore fully flexible. Otherwise they could rip a tendon or ligament. Also, proper form is how injuries are avoided as well. Another thing to be aware of is that too much repetition, especially in the beginning and more especially if done improperly, can lead to very painful and debilitating joint inflammation. Avoid excessive pressure on the joints. If any motion is painful, stop, find out why, take the time to heal, and do it right next time. The human body is complex and anyone interested in mastering it should learn all they can prior to and at their own realistic pace.
I'm mostly talk though.