WordPress need some essential plugins that make your site more secure, optimized & SEO friendly. The plugins that must be needed in your site are as follows:

1. Contact Form 7 / WPFORMs plugin
2. Anit Spam plugin – Akismet, Antispam Bee, Zero Spam for WordPress
3. SEO Plugin like – Yoast Seo, All in One SEO
4. Security Plugin – Wordfence Security
5. WP Optimize plugin like Litespeed Cache, W3 Total Cache, WP Fastest Cache
6. Manage backups, updates quickly and efficiently plugin UpdraftCentral Dashboard
7. Theme Builder – Elementor , WooCommerce & its add on
8. Google Analytics Plugin MonsterInsights
9. Custom Fields plugin ACF

I hope these essential plugins will definitely help in your next project.