I didn’t use DNF to update. This was an auto update.
I tried pressing esc but no response.
Try hitting the ESC key to see the output of the boot process. Failing that you can try to get a terminal with CTRL + ALT + F2
Both esc and Ctrl + alt + F2 doesn’t work.
A couple of time it happened to me and I shutdown the system badly and the system luckily never failed… So far…
But I always have a backup.
Should I restart it?
If it does nothing with esc I think it’s completely stuck and you have no alternatives…
Or maybe REISUB if you have it enabled.
@jakfrost what do you recommend?
I’ve never used REISUB
Edit: I did a restart and now I was able to boot the system.
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When it happened to me, the update was still there to be done, but a second run went smooth.
Check your backup just in case 
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So a reboot worked. Does it still work?
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Definitely, I’m making a copy now! I was a bit nervous, but thanks so much for your help!
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Yeah reboot worked, but I got a notification saying “An important update failed”. I’m not going to test my luck again by shutting down my PC, lol.
I read that some people couldn’t login after forced shutdown because of kernel failure. Is it true?
Edit: not hard reset, that would mean formatting, I meant to say forced shutdown.
What’s an hard reset?
Given a sufficient amount of people and old systems and long time of usage, everything could happen, but I’m using Fedora since 5 years I believe and I’ve never had big problems! Go ahead and enjoy your pc 
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If you mean a forced shutdown by powering off the PC, I very much doubt that would cause a kernel failure. More than likely it could cause damage to the file system due to improper shutdown. This then could lead to boot failure due to corrupted data in the filesystem. At the very least, btrfs checks would flag an error at attempted boot up, if errors are found.
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Yeah, sorry, I meant a forced shutdown. Thanks for your help!
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I had to look this up, expect many people reading will not know what it is.
Its a mnemonic that reminds you which SysReq keys to type.
But I think SysReq is not enabled by default.