I did crossfit 2-3 times per week for 1.5 years around 7 years ago at a gym where there was a lot of focus on technique, so it's been a while, but I didn't start from scratch with regards to technique.

That being said, I'm sure I have bugs in some of the exercises, I try to work them out via. videos and focusing on technique before I put more weight on the bar.

All the gyms I've been to here in Denmark have lifting platforms, squat racks, etc. so that hasn't been a problem for me.