Good parenting and child care encompasses many elements, from communicating to teaching and from showing love to keeping the child safe. The trouble is that few parents are actually taught how to be good parents; they simply have to wing it. And their own upbringing is usually a major factor in how they raise their child, whether they want it to be or not.
When all seems to go well, most parents cope and with the resilience that children have, they turn out okay in the end. That is not to say many adults could not have benefited in some way from their parents doing something different when they were young. However, if love is shown to a child, that is one of the main things to ensure they become steady and reliable adults, with much to give to society.
The trouble comes when something goes wrong and the parent does not really think that they need to address the issue. They believe that it is a temporary problem that will resolve itself. Or they may think this is the way their child is and nothing can be done. This is especially true when it comes to education, particularly if their own parents had a laid-back attitude to education.