I used to be pretty good at playing the piano, but I'm out of practice now. [=I haven't practiced so my skills are not as good as they were] If you want to be a good writer, you should write every day. Remember, practice makes perfect. [=you become better at something if you practice it often]
practice suggests an act or method followed with regularity and usually through choice.
PRACTICE definition: 1. action rather than thought or ideas: 2. used to describe what really happens as opposed to what…. Learn more.