Ahrefs Academy, https://ahrefs.com/academy.
Backlinko, https://backlinko.com/.
Daily SEO ID, https://www.dailyseo.id/.
Google Analytics Academy, https://skillshop.exceedlms.com/student/catalog/list?category_ids=6431-google-analytics-4.
Google Official Blog, https://blog.google/products/search/.
Google Search Central, https://developers.google.com/search.
Holistic SEO, https://www.holisticseo.digital/.
Moz, https://moz.com/blog.
Screaming Frog, https://www.screamingfrog.co.uk/seo-spider/tutorials/.
Search Agency (YouTube Channel), https://www.youtube.com/channel/UCX_JxI85sdGkYoKAKEARHig.
Search Engine Journal, https://www.searchenginejournal.com/.
Search Quality Rater Guidelines: An Overview, https://services.google.com/fh/files/misc/hsw-sqrg.pdf.
Semrush Academy, https://www.semrush.com/academy/courses/seo/.
SEO by the Sea, https://www.seobythesea.com/.
Site Guru, https://www.siteguru.co/blog.