Experienced players have started from the same stage as any beginner - starting from scratch, building from the very basics. How did these players make progress ? Which openings did they favour when playing White or playing Black ?
Experienced players' choices are still based on 4 general ideas they learnt as a beginner:
1. Control or occupation of the centre
2. King safety
3. Rapid development
4. Taking the initiative - developing an attack, being aware of good defence
Chess Kids guide
A comprehensive guide (111 pages) to commonly played openings.
Main ideas of opening play are well explained.