Keywords are keywords, that is, others search or read your paper, and you will know what the theme of your article is when you look at the keywords.

Generally, 3-5 keywords are enough.

For example, an article about the pathogenesis of 1 diabetes and the application of insulin, the key words can be diabetes, so-and-so signaling pathway, insulin and so on.

The format of the paper will have specific requirements in your school. General keywords belong to the last part of the abstract, followed by the text.