Black Hat SEO:
By following this process user gets fast results and cheaper because going against Google guidelines. These tactics carry risk that your website or content can gets de ranked, banned from the search results when google updates ranking algorithm.
White Hat SEO:
By following this process user gets lasting and compounding value over time as it carries less risk due to following Google guidelines but costs more to implement. Reputable SEO and content marketing agencies follow white hat SEO technics
Grey Hat SEO:
By following this process user falls somewhere in the middle as process are not specifically disapproved by Google’s Guidelines. But be careful to take this path as it is not safe to assume it will work or shield you from penalties and will get you into trouble.