Here is a comprehensive infographic from Digital Meal on SEO that’s relevant up to 2018 (and beyond). Some of the mentioned items aren’t necessarily new in 2018, but are still either part of Google’s core algorithms. There are also some items that are hotly debated in relation to their importance for SEO, such as Latent Semantic Indexing, as well as Query Deserves Freshness, which has multiple different sources and schools of thought.
