As we know that MacBook don't have some keys but full keyboard has,such as Page Up and Page Down, these keys invoked by fn + other key as below.
| Full keyboard | MacBook Keyboard |
|---|---|
| Delete(Forward) | fn-Delete |
| Home | fn-Left Arrow |
| End | fn-Right Arrow |
| Page Up | fn-Up Arrow |
| Page Down | fn-Down Arrow |