Should I block certain charecters from my EditTexts for security reasons? : I've been programming for about 6 months now, but also did a bit if code about 10 years ago.
I remember back then I had to block some characters from text fields for security purposes, so people won't type in some code that would cause harm.

Is it still relevant in 2019? Should I be worried about anything of that sort?

I am using Cloud Firestore as my server.

** My app would allow all languages, so I can't limit what characters ARE allowed as there are way too many.