Welcome to the forums, @gomsabigail990.
If you’re new to SEO, then the best place to start is Google’s “Search Engine Optimization Starter Guide“. It will give you a thorough grounding in all the basics, and you can be sure the advice given there is all sound.
The major search engines also publish webmaster guidelines, which you should consult on a regular basis. Google, in particular, has comprehensive guidelines on all aspects of SEO.
https://support.google.com/webmasters/topic/6001981?hl=en&ref_topic=3309300
https://www.bing.com/webmaster/help/webmaster-guidelines-30fba23a
https://yandex.com/support/webmaster/yandex-indexing/webmaster-advice.xml
While there is a vast amount of SEO information and advice available on the Internet, I would caution you to be careful, as much of it is outdated (even in recently-published articles) and may cause more harm than good. Unless you are very sure of the reliability of your source, I would suggest that you double-check everything with the search engines’ guidelines before proceeding. It is always easier to keep within the rules and avoid problems than to try to recover from a penalty later.