does Bill Gates is the founder of Microsoft need to be cited?

I don't think so. It's common knowledge.

When providing information, it is generally a good practice to include a citation if the information is not common knowledge. In the case of Bill Gates as the founder of Microsoft, this is a well-known fact and is considered common knowledge. Bill Gates' role as the co-founder of Microsoft is widely recognized and documented in numerous reputable sources. As a result, you do not need to include a citation for this information. However, if you are using this information in a formal or academic setting, it is always best to consult the specific guidelines or style guide provided by your instructor or organization to determine if citations are required.