I am new in SEO field, recently i am working on some wordpress websites, and i want to install SEO plugins for making very efficient SEO tasks. So can anybody tell me which one is the best plugin for SEO, which will be effectively help me to complete my SEO tasks.
Does your theme allow you to manipulate the META data (title, keywords and description)? IF so, then skip the plugin. They don't offer anything special outside of these. Focus on using the basic tools, writing good copy, acquiring quality links, and follow best practices first. These will do more for you then any SEO plugin.
Most any good WP framework or theme these days has excellent built-in features to do custom titles and descriptions. There is no need to be using SEO plugins that I think are a Red Flag to certain search engines.
Using plugins such as YOAST simply adds more baggage to your site and you are the mercy of the plugin author if they break something, go out of business, start spying on you, or if it creates a conflict with another plugin.
Focus on creating original content and media for your website and create value for your readers is the best SEO strategy I think.
The All In One SEO Pack is fine if your theme doesn't provide something already. Just remember these are tools and not magic bullets that will rocket you to the top of the SERPs. More than anything else, you still need to do your homework and have a good plan and execute it.
We use Yoast simply because we have integrated it into our operations, it's powerful, flexible, and it's simple to use. It's a thorough set of tools to handle noindex at the page level, htaccess editing, robots.txt editing, sitemaps, and many other onsite optimization functions within one package.
We've also used AIOSEO as well as a few others over the last few years. For now, Yoast is the one that we find the easiest to work with.
For context - We do not do "blogs" with WordPress, we use it as a CMS and rarely use the blog/category structure of the system. We use "pages", in proper hierarchy for roughly 95% of the content on the sites we build with WordPress.