How do I share iCloud Photos with others?

Read this support article to learn how to use Shared Albums in Photos on your iPhone, iPad, and Mac: How to use Shared Albums in Photos on your iPhone, iPad, and Mac - Apple Support

Shared Albums lets you share photos and videos with just the people you choose — and they can add their own photos, videos, and comments. Read this support article for more information --> How to use Shared Albums in Photos on your iPhone, iPad, and Mac - Apple Support

It depends whether you want to make a shared album or just share single photos

Create or join shared albums in Photos on Mac - Apple Support (IE)

Share photos and videos on iPhone - Apple Support (CA)

Create shared albums in Photos on iPhone - Apple Support (CA)