Technical SEO refers to website and server optimizations that help search engine spiders crawl and index your site more effectively to help improve organic rankings.
Search engines give preferential treatment in search results to websites that display certain technical characteristics: a secure connection, a responsive design or a fast loading time — and technical SEO is the work you need to do to ensure your website does so.
Use SSL. Secure Sockets Layer – It is a security technology which creates an encrypted link between a web server and a browser. You can recognise a site using SSL easily: the website URL starts with ‘https’ rather than ‘http’. A few years ago, Google announced that they will start giving preference in rankings to websites using secure HTTPS over non-secure ones; this can be simply done by installing an SSL certificate on your website.
Make sure you are not unintentionally blocking crawlers from indexing your website.
Speed your site up. Search engines prefer sites that load quickly: page speed is considered an important ranking signal.
Create an XML sitemap. An XML sitemap is a file that helps search engines to understand your website whilst crawling it
Consider enabling AMP. AMP is a Google-backed project which aims to speed up the delivery of content on mobile devices through the use of special code known as AMP HTML. AMP versions of your web pages load extremely quickly on mobile devices. Google sometimes highlights AMP in prominent carousels in search results – giving them an important search advantage.
Add structured data markup to your website. Structured data markup is code which you add to your website to help search engines better understand the content on it. This data can help search engines index your site more effectively and provide more relevant results.
Register your site with Google Search Console and Bing Webmaster Tools. Google Search Console and Bing Webmaster Tools are free tools from Google and Microsoft respectively that allow you to submit your website to their search engines for indexing. These services allow you to keep an eye on the general performance of your site from a search engine prospective.
SEO Jargon explained: Search Volume, canonical, nofollow, Google Keyword Tool, etc
Crawling is directly related to indexing. To optimize indexing, you can guide Google on how to best crawl your site.
Hyper Text Transfer Protocol Secure (HTTPS) is the secure version of HTTP, the protocol over which data is sent between browser and the connected website. The 'S' of HTTPS stands for 'Secure'. It means all communications between browser and website are encrypted.
There are various options when operating internationally: same root domain, different top level domains, subdomains, how to link between them, how to simplify the process without negatively affecting your SEO.
If your website is not mobile friendly, in most cases, you are in trouble. Google now uses the mobile version for indexation so called mobile first. If you are not sure, you can use Google's tool below.
Minimise ‘HTTP requests - keep the use of scripts and plugins to a minimum, use one CSS stylesheet (the code which is used to tell a website browser how to display your website) instead of multiple CSS stylesheets or inline CSS
Efficient Indexation is key in order to get on well with Google's spiders. Many believe the more pages indexed the better; that is only true to a certain level. If you have many non-valuable, not-visited or duplicate pages indexed for example, the bot will likely limit your crawling credit and discard those pages which you value most.
Whether for a site relaunch with a change of domain or switch to https, if the site structure is changed, some important steps need to be followed.
Google, Bing, Yandex and Yahoo agreed on a standardised format: schema.org for providing information about a page and to classify its content. using Structured Data will enable you to improve the way your pages are displayed.
For all countries: it is preferable to have a localised domain, hosted in target country, localised content adapted to target. Need to register and control traffic using respective Webmaster tools & local web services from dominating Search engines.
As mobile traffic increases, data creation on the web explodes. Google is trying to find ways to adapt to the new content. Mobile first is more than optimising your mobile version but it is the first step, especially if you currently offer a native app.