Here is a list of plugins that I consider Go To Plugins that I trust and use on a regular basis when I need to add a new feature to WordPress Websites.

Feel free to expand the list with plugins that you recommend that are published on WordPress.org

Contact Forms

Custom fields

Development and Operations

Email

Convenient for making newsletters, particularly when they need to be sent automatically after content is published.

Email sending server so your emails don’t get blocked by spam filters.

Galleries

Portfolio Pages

Images

Search

Security

SEO

SVG to WordPress Media Library

Taxonomy