Find is a computer programming language used to look for files.
It is designed so that the unknowing user will notice this fact by getting wrong results or annoying error messages. Here is the classical hello world program in find:
find -maxdepth 0 -printf "Hello World\n"
So now go ahead and learn how file input/output works in find (-fprintf), how you can use it for boolean calculations (-and, -or) and how you escape parenthesis properly from the shell, and make it even execute another command! Pre-order the book "Programming in Find" (253 pages) now!