Best practices for SEO

A robots.txt file can be found at the root of your website. As an example, for the website www.example.com, the robots.txt file is located at www.example.com/robots.txt. The robots.txt file is a plain text file that adheres to the Robots Exclusion Standard. One or more rules are contained in a robots.txt file. Each rule restricts or allows access to a single file location on the domain or subdomain where the robots.txt file is hosted. Unless you declare otherwise in your robots.txt file, all files are assumed to be crawlable.

See Sitelint robots.txt file content.

Once you have a specific topic, enter it in several search engines and see how users define it. Examples a few example for sentence Best practices for SEO.

Google

Bing

WordPress auto-generates the canonical URL link for the single post and page, but not for the Category page type. To achieve that you can add the following code to your functions.php:

function addCanonicalLinkForCategoryPage()
{
  if (is_category()) {
    $categories = get_the_category();
    $categoryId = $categories[0]->term_id;

    echo '<link rel="canonical" href="' .  get_category_link($categoryId) . '">';
  }
}

add_action('wp_head', 'addCanonicalLinkForCategoryPage');

1. Keep HTML file as small as possible.
2. Minify and compress JavaScript and stylesheets CSS. Compression could be done automatically by enabling gzip or brotli compression for all static assets.
3. Try combine all scripts or styles into one file. This will reduce total amount of HTTP requests.
4. Configure output cache and cache expiration time. Example for Apache cache or Nginx cache settings.

Read also 8 tips to speed up image loading.

1. Always provide an alternative description (attribute alt) for the image. It will not only help screen reader users, but also search engines to understand what exactly is on the image.

2. Implement Open Graph and Schema.

   Open Graph meta tags are snippets of code that control how URLs are displayed when shared on social media.

   Schema markup (schema.org) is a structured data vocabulary that helps search engines more accurately understand the information on your website that normally HTML can’t provide enough tags or elements to describe the content more precisely. See example schema for the product.