How do i store the first character of a word in a char variable?

Answer 1

char first = word.charAt(0);

Answer 2

0 is the starting index, so to get the first character it's always 0.

example:
String word = "cool burgers";
Index -> char
0 -> 'c'
1 -> 'o'
2 -> 'o'
3 -> 'l'
4 -> ' '
etc..
12 = word.length() - 1 -> 's'
charAt() returns the character at the index in the paranthesis, index 0 being the first char in the string.

Answer 3

how do I know what number to put in the parenthesis ?