Press and hold the volume up, home and power buttons. Release the power button when the device vibrates, but keep holding down volume and home button until the Android system recovery menu displays. Use the volume keys to scroll and highlight reboot system now. Press power to select, device will restart as normal.
If you can not do any of the things then other option is to contact the help from Samsung I can not help you they may ask you to send it to then to rebuild
I don't have problems understanding Android, check out my posts on here. I've had mobiles since the 80s. I was teasing you a bit. To reset you need to access recovery but for the last few years you need to connect the phone to a PC. All tips are gratefully received. Welcome to the forums.