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What is the difference between SEO and SEM? How should zero foundation teach itself?
The biggest difference

1.SEM charges for ranking keywords, while SEO ranks keywords through an algorithm to achieve the top ranking in natural search.

2.SEM can put keywords in the front in a short time, and SEO should put keywords in the front. The more popular the keywords, the longer the optimization time.

The basic suggestion is to train the learning system, with incidental items, which can ensure the quality of learning, and there will be employment services, which is quite good and greatly saves time and cost.