Learn one or two openings to about move 5 or so. You can play white and use these (I recommend Giuoco Piano, Wayward Queen, Bird opening). learn one or two counter-gambits/openings for black. I recommend the From Gambit, Kiddie Countergambit, queen's gambit declined austrian variation.
How to study/(learn/memorize/don't blunder without memorizing) chess openings?
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Then learn some more openings, but don't waste too much time with them. Tactics are more important in chess; just make sure to learn a few good ones so that you can survive the opening phase. Also analyze your games afterwards to see which opening you/your opponent played. It helps.
Oct 16, 2020
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#5
https://chessmood.com/blog/how-to-memorize-chess-openings-variations This article is the answer to your question and it's made by grandmaster 
Please help me. I always blunder in chess openings. Thank you.