Draw a line and fill it in the right place. Just don't scribble, and it won't affect or correct friends born after 90. You should have used it when you were a kid. I remember there was no correction fluid at that time. You had to use correction paper. The modified paper is a small square piece of white paper.

Usage: After you write the typo, put a small piece of error correction paper on the place where you write the typo, and then write the correct one on the error correction paper. Its disadvantage is that it is not beautiful enough.