please what will i write main()

Answer 1

Hello, 😊
Please, use the search feature before posting as to reduce the number of duplicate threads in Q/A section!👍

Entry point:
Every program needs a place to start its execution; talking about Java programs, that’s the main method.
https://en.wikipedia.org/wiki/Entry_point

https://www.sololearn.com/post/10362/?ref=app
Please, read our guidelines:
https://www.sololearn.com/discuss/1316935/?ref=app
An useful code for any new user here!;)
https://code.sololearn.com/WvG0MJq2dQ6y/
https://www.sololearn.com/Discuss/1305055/?ref=app

Answer 2

// main() is a function to write the codes to print the text, calculate...
// Without this function. It will return an error or nothing.

Answer 3

Just keep going with the course, you will understand it gradually, be patient and keep learning 👍