Why does OSX crash on user boot?

Question

macOS

Hello, an hour ago I wrote the code (engine for the project) and the computer started to lag a bit when watching the video, but during other actions everything was fine. I decided to restart the laptop and when I enter my profile, in the middle of loading everything breaks and a black screen with the "cancel" icon is displayed.
What could be the problem? Specifically, I don’t understand why it’s like that, I didn’t install extra software from third-party sources.