AI-written code works, but I can't explain it. 3 questions to help you understand it

I had an AI write some code, and the screen worked.However, the moment I thought, 'I want to change the number of questions' ...

Why does JavaScript sometimes work and sometimes not? Understanding the basics of loading order

I created a process to open a menu when a button is pressed, but nothing happens.Even with the same JavaScript, it suddenly started working when I changed where the file was loaded.In web development, ...