The "Delete" key will do that.
To delete an incorrect character in a document, simply click next to the incorrect character and then press BACKSPACE to erase to the left of the insertion point. You can also click next to the incorrect character and click DELETE to erase to the right of the insertion point.
no
backspace
The small square and circles around a selected graphic, are called sizing handles. To erase a character to the right of the insertion point, press the delete key.
Insertion point
You might mean the "Insertion point" or it can be called the cursor and also the I-bar. This is a vertical line [ | ] the height of a capital letter that is just after (to the right of) the last character typed or just before (to the left of) a character that will be deleted with the Del key when writing a left to right language.
The button that typically moves the insertion point to the right is the "Right Arrow" key on a keyboard. In most text editing software, pressing this key will advance the cursor one character to the right. Additionally, in some applications, you may find a "Right" button within the user interface that serves the same function.
yes it is to the right
yes it is to the right
The keyboard. Whatever you type will be inserted at the insertion point, provided Word is in Insert mode (the default). If it is in Overtype mode instead, and there is already some text to the right of the insertion point, what you type will replace it, character for character. You can switch back and forth between the two modes by pressing the Insert key on the keyboard, or by double clicking OVR on the status bar.
overtype
Insert Mode.