Bootloader Power off the device now hold volume down then power button until device boots to bootloader mode.
Recovery Power off the device now hold volume down then power button until device boots to bootloader mode. Release those buttons and use the volume buttons to scroll up and down until you see recovery mode then press power button to select it. Now you should see a android guy with no commands on the screen. Press and hold power for 3 seconds then tap volume up button. Now you are in recovery mode.
SafeMode power off the device. Press and release the power button to power it back on. As soon as you see the screen light up press and hold the volume down button until the device fully boots. you will see SAFE MODE in the bottom corner of the screen once it boots up.
Alternative methods to get in to different modes.
adb reboot bootloader
adb reboot recovery
Hold the power button to bring up the reboot menu on the device. Now long press Restart until Reboot to safe mode pops up.