1. Jetpack By WordPress
Jetpack can be considered as the ultimate toolkit for your WordPress website.
It has tools to help you design your site, track statistics, improve social sharing, and prevent attacks.
And ,all these core features are free, too.
You also have the option of adding advanced features like spam protection, daily backups, and SEO tools with one of their simple and affordable plans.
Another key benefit to Jetpack is that WordPress.com hosts all of its features.
2. Yoast SEO
The Yoast SEO plugin makes it easy for your site to meet the highest technical SEO standards. It also gives you the tools to bring your content to the highest standards of SEO and overall readability.
This means that by simply installing the plugin and following the steps in our wizard, you’re already fixing a lot of important technical SEO things for your site! That way you don’t have to know about technical things such as robots.txt, clean permalink URLs, htaccess files and sitemaps.
3. WP forms
Building forms in WordPress can be hard. WPForms makes it easy.
It’s easy drag & drop WordPress form builder allows you to create contact forms, online surveys, donation forms, order forms and other WordPress forms in just a few minutes without writing any code.
4. Akismet Antispam
Akismet is the best when it comes to checking your comments and contact form submissions against our global database of spam to prevent your site from publishing malicious content. You can review the comment spam it catches on your blog’s “Comments” admin screen. personally I use it a lot for catching spammers
5. WP Super Cache
The WP Super Cache WordPress plugin is one such plugin that helps you optimize your database by generating static HTML files, which are used to serve the request. This way, when any page is requested from your blog, static pages will be served instead of processing all of the PHP scripts.