How to use queen's gambit declined and sicilian dragon?

Question

from many opening in chess world...

GM in the world often use these opening...

so please help me....

Answer 1

QGD  Which one, Orthodox, Slav, that 1d4 d5 2c4 e5?! thing I've seen.

I can't say on the queen pawn stuff from experience, but try a few games with the dragon.  Moves you don't understand, vary in off hand games.  Your opponent will show you why.

Answer 2

They are long technichal openings that you need a book for.  Much better to use something less orthodox.

Answer 3

i dont know

Answer 4

This is too complex a question to answer here.

Suggestions:

(1) Buy a book or CD on both openings

(2) Have a look at some chess websites; some of them contain tutorials on the openings

(3) Join a chess club and ask!

All the best.