Title: For me, I think it was database design that was most useful - things like normalization especially.<p>Binary search I use a few times for an ecommerce cart. I remember to avoid putting loops inside loops.<p>I use Don&#x27;t Repeat Yourself (DRY) and SOLID principles for code design.<p>Besides that, I haven&#x27;t used them all that much. Which do you find most useful?
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