Suddenly it will not start

This is common when the battery cables are loose or when the battery goes bad. here are two guides to help you figure out what the problem is. The first test takes no tools, and the second repair takes minor tools. start by wearing gloves when you work with the battery, so you don't get battery acid on your, wash your hands when done. Also, if you have safety glasses, please wear those and keep others away when working with a battery.

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

and

https://www.2carpros.com/articles/car-battery-load-test

Let us know what happens and please upload pictures or videos of the problem.