If you want your children to reach their full potential, answer every single question they ask you. If you don't know the answer find it out.
That probably sounds really obvious, but I read it in a newspaper article in 1992 when pregnant with DS 1. It was about an American couple who had 6 off the scale gifted children and were themselves only high school educated, and were mildly bemused about where the brains came from!
Anyway, the advice, which is basically just to be interested in your children and to encourage everything they do, made sense to us so we did just that.
Fast forward 18 years and my 4 all do fantastically well. They speak several languages (taught both at their schools and by themselves} they play several instruments each,and lots of sport.
All are many years ahead of their peers academically, and all get on with people from a huge range of different backgrounds.
People tell us what nice, happy and well balanced kids they are with alarming regularity.
We could afford to privately educate, but believe in the state system, and our lot attend state schools that would probably make some mumsnetters keel over in a dead faint 
Our high school has just come out of special measures (not that I take Ofsted seriously!!),however DS2 is doing a couple of A levels two years early, and the oldest will be going to a top Russell group uni after taking a year out.
I'm really, truly not boasting, just illustrating that it's a myth that children who are privately educated necessarily achieve any more than children educated at their local state schools.
If you answer every question, give them lots of experiences, spend lots of time with them just talking, let them do sports, music, trips to theatre and museums if funds allow you won't go far wrong. 