Internal SEO website code optimization, SEO writing articles. AddWords Facebook advertising

A website or an e-shop will have no value if customers cannot find it.
The simplest way to achieve this is to pay for advertising (e.g. Google Adwords).
However, excellent results can be achieved without buying advertising, but rather optimizing a website/e-shop.
Search engine optimization (SEO) is a method that will make your site visible, and easily found in search engines (Google, Yahoo, Bing, etc.).
There are two types of SEO: internal and external.
Built-in SEO – creating a website software code, correcting structure and texts, entering keywords, HTML tags, meta titles, meta description tags, sitemap.xml, robots meta registration in Google Analytics, Google Webmaster tools, Bing Webmaster tools systems.
External SEO – social marketing (work with Facebook, Twitter, LinkedIn, Instagram, Tumblr, etc.), back links, and dissemination.
SEM is a midpoint between paid advertising and SEO.