A standard CrossFit without is done with good form and control.
For instance, if you were asked to perform a workout which required handstand push-ups and you couldn't do them, you could scale to a box and do a more triangular movement, or you could grab some dumbbells and push-press. If a movement said 100kg deadlift and you can only comfortably deadlift 40kg then you would use 40kg instead.
Most coaches will talk through this and if you have questions, they'll mostly be happy to answer. Of course there are some coaches out there which aren't doing their job correctly, but most of them are really good at what they do.
That wasn't true several years ago during the Uncle Rhabdo phase, and Crossfit only changed its tune because of the overwhelming bad press about injury rates. Back then, it was about doing exercises as fast and as many times as possible.
[1] https://journals.lww.com/acsm-msse/Fulltext/2003/05001/U_S__...
My personal injury was a pinched sciatic nerve brought on by a session of improper deadlifting. I made the mistake of rushing through a workout near when I was lifting my heaviest. Took about 3 months for the pain to go away.
I’m thinking an intense workout with good form and control vs. a standard CrossFit workout.