For example you can't decide which CPU to buy, you can make a decision by looking at the Intel Core i7-8557U GeekBench 5 score single and multi core test and understand is it a good CPU or a bad one to buy, how powerful is this CPU. Here is all information from GeekBench 5 benchmark. A step-by-step analysis of all the technical characteristics, to make it easier to read, is summarized in the table. After looking at the data this test and video, you can already make an informed decision about do you need to buy Intel Core i7-8557U or not.
All the figures in the text above do not mean that taking them into account you should completely trust a simple quantitative comparison. Better to watch the video tests and read the opinion of real owners of Intel Core i7-8557U before deciding buy this processor or not.