The first and second statement needs to be cited. The third and fourth statements are common knowledge.
Common knowledge is widely known, uncontested, verifiable, and typically not attributable to a specific author. Therefore, it does not require a citation in your paper. It can be tempting to cite every sentence in order to prevent plagiarism, but doing so excessively can occasionally make your academic writing weaker. Common information must be properly referenced to avoid plagiarism. Giving credit to the author within the publication is known as using an in-text citation. You are not required to cite something if you use your own words to paraphrase another person's views. You must cite any information that you summaries from another text.
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