WordPress Plugins are PHP scripts that extend the functionality of WordPress. They enhance the features of WordPress or add entirely new features to your site. Plugins are often developed by volunteers and are usually free to the public. Plugins are available via the WordPress Plugin Directory. All you want is just go to WordPress dashboard –> Plugins –> Add New –> search plugins from “Search Plugins” Searchbar click install then Activate the plugin
Here are the WP plugins that I use
Akismet is quite possibly the best way in the world to protect your blog from spam
Classic Editor and Classic Widgets
This plugin disables Gutenberg editor totally everywhere and enables Classic Editor & Classic Widgets. Once activated, this plugin hides all functionality available in the new Gutenberg block editor. Also, you will be able to use old-style Classic Widgets under Appearance > Widgets and Appearance > Customize > Widgets. There is no need to set up any configuration.
This plugin makes your Web page visitors contact you through WhatsApp with a single click/tap
Adds a user-friendly and fully automatic way to create and display a table of contents generated from the page content.
Image and video gallery from Google Drive
A WordPress gallery using Google Drive as file storage
WordPress security, performance, marketing, and design tools — Jetpack is made by WordPress experts to make WP sites safer and faster, and help you grow your traffic.
Yoast’s mission is SEO for Everyone. Our plugin’s users range from the bakery around the corner to some of the most popular sites on the planet. Yoast SEO Free contains everything that you need to manage your SEO
A most wanted plugin, (I have already set up an auto backup of my WP files and database using a script) UpdraftPlus simplifies backups and restoration. Backup into the cloud directly to Dropbox, Google Drive, Amazon S3
Ninja Forms is a web form builder with unparalleled ease of use and features.
A plugin for WordPress to easily display slideshare.net presentations.
Embed beautiful and feature-rich tables into your posts and pages, without having to write code.
For making email deliverability easy for WordPress
Beginner-friendly WordPress popup builder plugin.
Secure Copy Content Protection and Content Locking
Secure Copy Content Protection is a plugin aimed at protecting web content from being plagiarized.
NB: Plugins can only be installed and used if you either self-host your WordPress or use a WordPress.com Business Plan
Reference: https://wordpress.org/support/article/managing-plugins/