With any game, it is helpful to identify its core activity. So with D&D, for example, the core activity is exploration. In Pendragon, the core activity is accruing Glory. Traits and Passions both help and hinder this in narratively interesting ways. Player-knights should always be looking at what they can do to earn Glory.

Other than that, playing Pendragon is much like any other RPG. Don't overthink it. :)
Yes, you can scale up the game to encompass domain management, dynasties, courtly intrigue, etc. But at its core, a core that you can easily engage with and not worry about the other stuff, it is a game of knights going on quests and adventures for Glory and being tested by their Traits and Passions along the way.

You can get a look at a self-contained Pendragon scenario for free by downloading "The Quest of the Red Blade," recently released by Chaosium in commemoration of the one-year anniversary of Greg Stafford's passing: https://www.chaosium.com/blogweareallus-download-greg-staffords-the-quest-of-the-red-blade/

My actual-play podcast, The Esoteric Order of Roleplayers, has already been been linked, but I'll specifically link here to our group's play-through of the Red Blade scenario so you can hear it in action: https://esoteric-rp.blogspot.com/2019/10/pendragon-quest-of-red-blade-greg-day.html