The most important SEO Modules Drupal 7

Then go to «Delete aliases» and click «All alias» and delete all alias. After that, open «Bulk update», choose the way without aliases and save the configuration.

After saving configuration instead of this:

we get nice SEO-friendly URLs:

Transliteration - is a necessary seo-module for non-latin titles on a site. If you’ve installed Pathauto module already, you would need Transliteration module as while creating new material with non-latin titles appear in line of SEO-friendly URLs. Transliteration module transforms other letters into Latin letters. For example, instead of URL your-site/последние-новости-в-Украине-и-мире we get your-site/poslednie-novosti-v-Ukraine-i-mire.

GlobalRedirect - is an important module which helps to avoid pages duplication. It puts 301 redirect from incorrect URLs into correct ones automatically: from the pages with «/» - into the pages without «/»; after «clean URL» - it redirects to clean URL (without ?q=).

Metatag - is a very useful module. Here you can tune in title, meta description and meta keywords. 

With the help of patterns it is possible to make these tags relevant and unique for each page automatically.

XML sitemap - is a very useful module which helps to tune in xml sitemap and indicate the desired indexation for all page types. After creating sitemap, it is necessary to tune it in.

It is recommended to put the minimum sitemap lifetime 1 day. For homepage it is recommended to set the highest priority, but for the rest pages 0.5 (normal) is enough. After saving configuration, regenerate the map and that’s it!

RobotsTxt - is a module for robots.txt file creation where you can allow or close access for search engines to the certain pages of your site. This file has directories with slash at the end of the line by default:

…
Disallow: /includes/
Disallow: /misc/
Disallow: /modules/
...

Sometimes the index of search engine catches such links as .../includes , .../misc , .../modules (without «/»), that's why it is necessary to clear all slashes at the end of each directory. Put «host» with domain without http:// and indicate «sitemap».

Note: User-agent * is used mostly for important bots (YandexBot, Googlebot) which come to your website.

Menu Breadcrumb - is a module which adds breadcrumbs to menu lines of any rank and type. You can see the recommended settings of the module on the following image:

So, in this article we've described all the modules which we consider to be useful and helpful for the website SEO. For sure soon this list will grow because a lot of modules are in the state of development right now and we are improving as well. BTW we are preparing a new blog about those SEO-modules which are not that necessary for your site but definitely will make it better. Follow our blogs and let the SERP be with you :)