Check Internet Connection:

Play Store needs internet. Test by opening a website in browser. If browsing works, the issue is Play Store specific.

Clear Cache and Data:

Settings > Apps > Google Play Store > Storage > Clear cache, then Clear data. Forces fresh start.

Clear Google Services Cache:

Also clear cache for Google Play Services and Google Services Framework. All three work together.

Check Date and Time:

Wrong date causes Play Store errors. Settings > Date & time > Automatic. Ensure correct time zone.

Remove and Re-add Google Account:

Settings > Accounts > Google > Remove. Restart phone. Add account again.

Update Play Store Manually:

Download latest APK from trusted source like APKMirror. Install manually. Updates bypasses broken version.

Conclusion:

Clearing cache for Play Store and related services solves 90% of issues. Date/time is a hidden common cause.