Well, you have three options forward. Either treat them like children and just explain on a loop, or you demand that they follow the basic process of adult reasoning and learning. The last option is abandonment, teacher/instructor burnout is a real thing.

And "I don't understand" should not be acceptable. Let them write out what they did and what exactly they don't understand.

For example:

To find out more about main, I searched for "Java main", and got the following: "All Java programs must have an entry point, which is always the main() method. Whenever the program is called, it automatically executes the main() method first. " Yet when I look at this code here, line ref/ code snippet, I don't understand why it doesn't have a main....

I don't have any natural talent for programming nor math, and cried for 2 weeks straight when I was going through my first programming book, my brain literally hurt. I just ground that book.

Taking a book and typing out all the exercises, muscle memory. You work your ass off for 10 years, and suddenly you get lucky.