Comment by mariarmestre

This is to build your own knowledge base. In many cases, Wikidata might not have the data you're looking for. For example, in the tutorial I have linked, the task is to come up with all the products released by a list of companies. Toutiao would be a product of Bytedance. This is a relation that might not exist on Wikidata (I tried to search for it but could not find it https://www.wikidata.org/wiki/Q24835387).