Links are necessary when you quote some fact or data, especially when the data is not yours. External links are often used as references, while internal linking encourages users to view other related pages.
Schema Markup is a method through which search engines understand the structuring of your page.
Meta titles and Meta Descriptions are essential because, after a certain length, Google truncates the extra characters.
URL categorizes pages and posts as per their respective categories. A well-categorized set of pages is easier to get indexed by Google using a sitemap.
Image search is one of these search engine variations, which looks for images relevant to a search query.
Headers are the titles or subtitles that help distinguish the topic and the text of the articles.
Keywords are those specific words that people use to search for anything online. If these are found in a page, search engines will include them in their results.
On-Page SEO is the optimizations that you can do by modifying your website, its pages, and its posts.
SEO optimization is a relatively easy task if you have a stepwise approach. You have to take care of the three pillars of SEO: On-Page, Off-Page, and Technical SEO.