It is not possible to know what you need to learn.
In a true zero-defects approach, there are no unimportant items.
Quality management is needed because nothing is simple anymore, if indeed it ever was.
Quality is free. It's not a gift, but it's free. The 'unquality' things are what cost money.
If anything is certain, it is that change is certain. The world we are planning for today will not exist in this form tomorrow.
The customer deserves to receive exactly what we have promised to produce - a clean room, a hot cup of coffee, a nonporous casing, a trip to the moon on goassamer wings.