In the insert mode, you can use Backspace to delete the wrong words when you in the INSERT MODE.
There are some other way let you to delete a char or word in the INSERT MODE.
| Keystrokes | Effect |
|---|---|
<C-h> |
Delete back one character (backspace) |
<C-w> |
Delete back one word |
<C-u> |
Delete back to start of line |