OK, working my way through this bit by bit - reached p.5 now!
There seems to be lots of talk about cutlery. Yes of course it's important to teach your children to use cutlery correctly. The basic rules of table manners are there for good reason. Just sit opposite someone who is oblivious to them and see how quickly you feel sick, or just decide that they are an uncouth peasant.
Secondly, some people seem to be confusing teaching manners with 'forcing' children to parrot pleases and thankyous at too young an age. No-one condones forcing anything on two year olds but gentle persuasion and encouragement is perfectly fine. Don't assume they will just pick it up without any need for reminders. I know plenty of perfectly polite adults with perfectly rude obnoxious children, because they've not, for whatever reason, found it necessary to reinforce their own example with firm but gentle reminders.
My sister's four children are all very nice, sweet, good natured, honest and decent young people (aged 14-19)_but they all lack basic good manners, etiquette/social graces, and they speak appallingly so struggle to express themselves clearly at times. The result is that they come across as rather brash, uncouth, selfish, rude, abrupt, ungrateful, sullen, and frankly, thick as pigshit. They aren't, actually any of those things. I know that, but the rest of the world, including future employers, does not. They base their first impressions on what they see and hear.
Do your children a huge favour OP. Start encouraging them to show a bit of respect to others, and don't make assumptions that because you are not offended by them, others won't be.