I thought of a way to keep info safe from other people in a code.
So here it goes. You could write in a special code that only you and anyone else on your side knew. This code would be hard to break as it isn't in another language like Spanish or German, but your own.
Writing backwards it one, but easy to break.
Writing in alphabet backwards is pretty hard.
Writing in numbers is also pretty hard to break.
It'd be hard to master this, but it would keep info safe. Another one is creating your own by replacing each letter with another letter.
This is just an idea, you don't have it use it o.o