I can’t help with hacking an Android phone.
If you’re trying to secure your own device, enable a strong screen lock and biometrics.
Keep Android and all apps updated.
Install apps only from trusted sources.
Review app permissions regularly.
Turn on Find My Device and remote wipe.
Use two-factor authentication on important accounts.
Avoid unknown links, attachments, and APK files.
Use a reputable mobile security app if needed.
If your phone may be compromised, back up data and factory reset it.