Open your device Settings
Tap General or System
Tap Keyboard
Turn off Auto-Correction
Turn off Predictive Text if needed
Turn off Spell Check if needed
On iPhone or iPad, go to Settings > General > Keyboard
On Android, go to Settings > System > Languages & input > On-screen keyboard > your keyboard
On Windows, go to Settings > Time & language > Typing
On Mac, go to System Settings > Keyboard > Text Input
Save or exit settings