How can I prevent a hard boiled egg from cracking while cooking?

To prevent a hard-boiled egg from cracking while cooking, you can gently place the egg into boiling water using a spoon, rather than dropping it in. This helps to reduce the impact on the eggshell and minimize the chances of it cracking. Additionally, you can add a little bit of vinegar to the water, which can help strengthen the eggshell and prevent cracking.