Plugins are extra code that adds specific functionality to your WordPress site. There are thousands of plugins in the WordPress repository from contact forms, page builders, security, SEO, Lesson Management e.t.c. The steps below show you how to easily install a plugin.
Step  − Go to Plugins and click Add New as shown in the following screenshot.
Step  − Search for a Plugin and click Install Now.
Step  − Click Activate.
NB: Much as plugins add functionality to your site, installing too many plugins will slow it down. Install only plugins you can’t do without.