There have been crashes for as long as there have been races. In my opinion, you can go on all the training events you like, you can learn your 'drafting skills', your 'group riding skills' and all of that stuff. But there is nothing - absolutely nothing - that you can learn from those exercises which will prepare you for your first bunch race - and even that pre-supposes that you will have the fitness to stay in the bunch long enough to actually lean something. And even if you do stay with the bunch and learn all this stuff (which isn't actually that difficult, tbh, most of it is common sense) you might still crash. Bunch crashes are usually caused by momentary lapses of concentration, and if that happens, then your knowledge of riding etiquette (or lack of it) is largely irrelevant whichever way you look at it. It's the same reason why you still get crashes regularly in the pro peloton - and you would hope their group riding skills are already well-developed.
Put it another way - people with full driving licences still manage to crash into each other in cars, despite (you would hope) their overwhelming desire not to.
That's not to say that learning the skills is not helpful - it certainly won't do any harm - but knowing them won't guarantee you a safe race and it won't guarantee that an experienced rider won't take you out on the last corner. So, you might as well do what TMHNET said earlier, and just get on with it.
