Technical SEO refers to practices in on-page web development that impact SEO; things like website architecture, markups, internal linking, and site speed optimization. As modern technology brings machine learning and artificial intelligence to search, technical SEO will remain extremely important in communicating well to search engines.
Similar to entities and machine learning is schema. Schema is a markup language that quickly tells search engines how topics are related to each other. Schema.org has all of the codes you need to learn how to use it. With Schema markup on your website, Google will have an easier time connecting the dots between all of the content you’re publishing.
The hreflang tag is essential to any international SEO strategy, as it tells Google which language and country-based webpage to show users, based on their location. But using it properly is critical, as there are many common misuses of hreflang. As the Internet promotes globalization more every year, Aleyda Solis named it as one of her top pieces of advice to study in the upcoming year, especially for international SEOs.