The loop is ongoing with no options to select any advanced options. This HP laptop has no CD/DVD drive.
Preparing Automatic Repair
🙁
Error 0xc000021a
Ongoing loop no CD drive no other options to select just loop of error and preparing automatic repair
HP laptop
It must be very scary to see that you are unable to boot into your PC. However, there is almost always a way, no matter how bad things may seem.
Even if you do not have a CD/DVD slot on your laptop, it must have a USB stick slot which you can use to reinstall Windows completely. To do that you will have to use a working computer in order to download Windows 10 bootable media from here: https://www.microsoft.com/en-us/software-download/windows10. Download the Media Creation tool and insert it into a bootable USB.
Alternatively, you could check the second fix in the following article: https://ugetfix.com/ask/how-to-fix-error-0xc000021a-on-windows-10-and-8/.
Good luck!