A lead in development is an opening advantage which vanishes with time, so the side with this lead must act energetically. It is highly dependent on pawn structure as it has little or no importance in positions with a closed structure. On the other hand it can be hugely important in open positions. Often players sacrifice a pawn or pieces in order keep the opponent busy capturing the material. The best advise for the defence is not to be too greedy.
At beginners’ level you often don’t need to sacrifice the material to get a lead in development because they often make many pawn moves or move the same piece many times without good reason. This givesand gifts the same advantage to the opponent therefore beginners have been advised not to do so.
Here is an instructive example illustrating this theme:
Veselin Topalov against Vassily Ivanchuk in 1999
Here Black is a pawn down but he has lead in development. As I mentioned earlier the side with lead in development must react energetically, so how would you follow the same piece of advice?
If 2.Qb1 then 2…Qxc3 2.Bd2 Nc2! is winning.
Keeping the king in the center.
If 3.Qxe2 then 3…Qxc3 is winning
Compare the positions. Black has mobilized all of his pieces which fully compensates him for the sacrificed piece. White resigned after a few more moves, here’s the finish in case you’re interested.
4. Qb4 Qh5+ 5. f3 f5 6. g4 Qh3 7. gxf5 Bxf5 8. Qc4+ Kh8 9. Re1 Rxe4+ 0-1