Focus on your data structures a.k.a. data tables. Those depend on your problem domain (the thing you are poking at with software). Then and only then, you may

Focus on your data structures a.k.a. data tables. Those depend on your problem domain (the thing you are poking at with software). Then and only then, you may want to look at what is too slow on your particular CPU and OS. All the rest has been noise since before LLMs. This includes "algorithms" a.k.a. flow charts. Fred Brooks boiled it down to its essentials. And that never changed.