For a beginner I’d recommend getting Google Analytics, Google Search Console & Bing webmaster.
Google Analytics is a platform for collecting data on your website. You can find where your traffic comes from, popular pages, individual page data, sales conversions, etc. Big tool that can do a ton.
Google Search Console is for getting Google Specific data. Can they crawl your site, how many impressions, clicks and how pages and keyword rank. Useful tool for beginners or any Tech seo person.
Bing Webmaster is similar to that. It also connects to yahoo, so you’ll push your data to 2 other larger search engines.