10 practical rules of opening

1. e4/d4

2. threaten something

3. knight before bishop

4. most suitable square once for all

5. pawn move not more than two

6. no queen move

7. castle early and kingside

8. atleast one pawn in the centre

9. control the centre

10. no sacrifice without adequate reason

• pawn sacrifice for advantage 
• deflect the queen
• prevent castling
• build up a strong attack