Question about choosing a game from a beginner
Sounds like your best bet would be to look for a freeform or guided freeform game. There's not really much of a system to learn in them, it is entirely based on collaborative storytelling. That said, as is true anywhere in life, some people are better at collaboration than others...
The downside to freeform games is that there is a propensity for some pl games years to decide they want to do something "cool", regardless of how it fits within the game, or to just outright try and hijack the game to tell the story they want to tell. Another common problem is "God-modding" or dictating actions, reactions, feelings, perceptions etc for other players or usurping the GMs role as moderator, judge, referee, and primary storyteller. And it's hard to know before you're playing with someone whether they're a good collaborator. A good GM helps a lot...being willing to step in and say, "Yeah, that would be cool...but that kind of equipment doesn't exist in the world I created" does a lot to keep people on theme and slows down the tendencies to try and run away with the game.
Some people play ONLY freeform games. Some people can't stand them. Some people are okay with both.
If you do settle on a system-based game, you want to look for one that is role-play oriented. Some GMs want everything done precisely by the rules, and that can be really frustrating for a new player. A few I have played with just let you write up what you want to do, what your character intends to do, and they'll take care of the dice rolls if any are needed (a lot of times, such GMs will look at the post and say, "sure...that's a smart move by an experienced character and there's no good reason it WOULDN'T work", and just allow the action, without dice.)
I can't really recommend any specific system, because it's as much about how the GM implements the system...I've had GMs turn the simplest of systems into a headache, and I've seen GMs simplify notoriously complex systems like GURPS into the most basic and enjoyable role-playing experiences.