/* I havent understood this pls someone help me.

Answer 1

/*
hello
there!
*/

The /* */ comments work over multiple lines. Everything between /* and */ is ignored by the compiler.

// just means ignored everything after //, but only on that single line

Answer 2

https://www.sololearn.com/discuss/96845/?ref=app
https://www.sololearn.com/discuss/1091816/?ref=app