Open Settings
Tap Sounds & Haptics
Turn off Keyboard Clicks
Open Settings
Tap Sounds
Turn off Dial Pad Clicks or Keyboard Sounds
Open Settings
Tap System
Tap Languages & input
Tap On-screen keyboard
Select your keyboard
Turn off Sound on keypress
Open your keyboard app
Open Keyboard settings
Turn off Key press sound
Use the volume buttons
Lower the system volume to mute keyboard sounds
Switch your phone to Silent mode
Turn on Do Not Disturb if needed