Open your device settings
Tap General or System
Tap Keyboard or Language and input
Find Predictive text or Text prediction
Turn the feature off
On iPhone, go to Settings > General > Keyboard and disable Predictive
On Android, go to Settings > System > Languages & input > On-screen keyboard > your keyboard app > Text correction and disable Predictive text
On Windows, go to Settings > Time & language > Typing and turn off Text suggestions
On Mac, go to System Settings > Keyboard > Text Input and disable predictive text
In many apps, open the keyboard settings and turn off suggestions or autocorrect