Yes, these reviews do affect the SERP (Search Engine Results Page) ranking as they account for around 15% for determining the website ranking based on the reviews and their response from the website or local businesses.
Overall, reviews do affect your website ranking.
If you want to be an SEO expert, then I would suggest you take up an SEO course from Intellipaat to help you get started.
Also, have a look at our YouTube video to get a good amount of insight on SEO.