Going along with the video

Loops can be a bit hard to understand at first, but once you know the syntax it will make loads more sense. In a "for" loop: you have a variable that executes the loop "for" a given amount..thats where the "for" comes from. In contrast there are "if" loops that take a variable and execute "if" a value matches.

In a for loop, as an example, you could have:

for (int i =0; i < 3; i++) {
print("looping");
}

the "int i = 0" is declaring a variable called i, which will control how many times the for loop, loops. In my example, the first time this happens, the loop will see that i =0 so i is in fact less than 3, so do the command "print("looping");" , The loop then sees that its steps within the curly braces are completed and adds +1 to the value of i. Now i =1, and i is infact less than 3, so it will again execute the print("looping"); statement. You can see how the loop will continue until i =3, and i is now no longer less than 3, so the loop will exit and NOT execute its steps. This way, the statement "print("looping");" will only happen 3 times as directed.

This begins to be useful when wanting to traverse array's as done in the video. the variable, i, is used to indicate the index of an array, which he is then adding together.

Hope this helps!