Leonardo Da Vinci used to write backwards in his notebooks, in order for his ideas and secrets not to be stolen.
As a left handed person, it’s pretty easy for me to write backwards. It feels like something in my brain wants the letters and words to go that way, even though I never practice.
A right handed person can write in reverse with their left hand without much practice, by holding a pen in each hand, pretending to write with their right and mirroring the hand movements. It's even easier if you just "write" with your finger, eg on a foggy mirror, rather than holding a pen. The scripts we use are definitely optimized for right handed writing.
everyone can write backwards.
place a piece of paper on a board,turn it 180degree facing away from you,writing on it with the pen pointing towards you.