Open Chrome or your browser app
Tap the three-dot menu
Go to Settings
Tap Site settings
Tap Pop-ups and redirects
Turn Pop-ups and redirects off
Go back to Site settings
Tap Ads
Turn Ads off
Open your phone Settings
Tap Apps
Find suspicious or recently installed apps
Uninstall apps you do not recognize
Check app permissions
Remove permission to display over other apps
Open Google Play Store
Tap your profile icon
Tap Play Protect
Run a scan
Install a trusted ad blocker if needed
Clear browser cache and data
Restart your phone
Keep Android and apps updated