How to enter into BIOS from a Windows 7 or 10 OS using Dell/Other laptop?

1. Start Windows
2. Navigate to Settings
3. Select Update & Security
4. Select Recovery
5. Click Restart Now
6. Click Troubleshoot
7. Click Advanced Options
8. Select UEFI Firmware Settings

Alternately, you can keep pressing the F1 / F2 / F12/ DEL button continuously after restarting the system.