Assuming your camera includes an Automatic Exposure Bracketing function, follow these steps to take bracketed photos:
1.
Set the ISO to 400 or lower.
2.
Set your camera to Aperture priority mode (usually abbreviated A or Av).
3.
Set your camera to Auto Exposure Bracketing (AEB) mode.
4.
Using the AEB options, set the EV spacing to +/-
2 EV if your camera supports it, or otherwise to the highest EV spacing it supports.
For more details on AEB setup, see this webpage for pictures and videos showing how to set Exposure Bracketing on various camera models.
5.
Switch your camera to Continuous Shooting mode.
6.
Frame the shot, check the focus, and press and hold the shutter button until the bracketed photos are taken.