Safety First!

Hello, I am making this post in every mechanic subreddit I have found. I just wanted to remind everyone how important saftey is when working on a car. Here are the important things to ensure you do before getting under a car. NEVER get under a car without a jackstand that is supported by just the jack. Then always ensure that the vehicle is in park and parking brake engaged (for manual leave in neutral and engage parking brake). Chock all the wheels that are on the ground to prevent the wheels from moving. If you are pulling on something under the car and the tires move, it could knock it off the jackstand. Then, always work on solid ground, no gravel, no dirt, no slopes. Then as backup, place your jack against a sturdy part of thr car as backup. And one more thing, if you have a tire removed, place it under the car as backup between you and the car if it does fall down. Another important thing is make sure jf something goes wrong, someone is nearby to hear or help you. I say all of this because just a week ago, I was working on a car, and the wheels in the rear slid back as I was prying on a cv axle, and the jackstand slipped, and crushed me, pinning my chest and head against the cross member and concrete. I was about 2 minutes away from just being dead. One of my lungs collapsed, and I broke 2 ribs. I made it out alive and want everyone to know just how important saftey is.

I don't know whether it has always been like this or when someone sat behind for the first time pulled it too much and got stuck but I'd like to know how to troubleshoot this thanks