Loops are handy, if you want to run the same code over and over again, each time with a different value.
Normally you will use statement 1 to initialize the variable used in the loop (i = 0).
You can initiate many values in statement 1 (separated by comma):
Often statement 2 is used to evaluate the condition of the initial variable.
If statement 2 returns true, the loop will start over again, if it returns false, the loop will end.
Often statement 3 increments the value of the initial variable.
Statement 3 can do anything like negative increment (i--), positive increment (i = i + 15), or anything else.
Statement 3 can also be omitted (like when you increment your values inside the loop):