How to add friends on Steam in 3 different ways, to join their multiplayer games and more

To add friends on Steam, you can enter their Friend Code, click a link, or go to their profile. Most of this can be done from just one menu.
PCGamesN

Now you can invite non-Steam friends to play Steam games with you

Steam's Remote Play Together feature just got bigger and better. Now you can invite anyone into your Steam Remote Play sessions, regardless of whether they even have a Steam account themselves. All ...
The Verge

Steam’s multiplayer game streaming now works with friends without Steam accounts

is a reporter with five years of experience covering consumer tech releases, EU tech policy, online platforms, and mechanical keyboards. Steam’s Remote Play Together feature, which lets you stream ...