WordPress SEO Plugins can certainly improve the SEO of your WordPress site and there are many to choose from. However there are a few mistakes that you need to avoid.
Thinking that WordPress SEO Plugins will solve all your SEO Problems
If you are not getting the results you were hoping for you might think that installing a few WordPress SEO Plugins will solve the problem. Depending on how good (or otherwise) your on page SEO is, this may help but it won’t solve any underlying problems.
If the keywords you are targeting are too competitive nothing will be able to help. The best solution is to undertake more keyword research and find some that are less competitive.
It could also be that you simply do not have enough backlinks. You should use a tool like Traffic Travis to view the competition for your keywords. If you are matching your competitors for backlinks, check your external links to ensure that you have not linked to a dubious site. If not, then WordPress SEO Plugins should be able to help improve your on page SEO which will leverage the effect of the backlinks.
Not Understanding WordPress SEO Plugins
Whilst it is acceptable to install a general Plugin like “All In One SEO Pack” and leave the default settings it will still be beneficial to understand what it does so that the settings can be adjusted as necessary.
With other WordPress SEO Plugins which do things automatically it is important to understand what they do otherwise the results can be unexpected and might clash with things you have done manually.
Installing too many WordPress SEO Plugins
There are many WordPress SEO Plugins that do similar things and therefore should not be installed together. If this does happen the results will be unpredictable. When installing a new plugin you should be sure that you know what it does and what the benefit will be and that it does not duplicate part of the functionality of an existing plugin.
Concentrating on the detail and missing the obvious
It is easy to install Plugins that each make your site a little bit more search engine friendly and forget that having properly optimized content is far more important.
You must have unique content built around a keyword so that the search engines understand that it is highly relevant to that keyword. One of the options to help with this is SEOPressor.