Cant figure out why my move was a mistake?

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Pradeepg93

Hi this is Pradeep. ive been playing chess for a year now rated 1000 now. Whenever i analyze my game, there are mistakes and blunders which is common for beginners. But the thing is, mostly i cant figure out why its a mistake, especially in the openings where i am just developing the pieces.  I need some advice to fix these and understand my games better. Thanks.     

ChesswithGautham

Send in some examples