First off, welcome! You’ll love the steam deck. I don’t have any specific hidden gems but if you’re planning on using this a lot on public transit, look for smaller games to play like Dredge. Anything too intensive will drain your battery a ton faster than a smaller game. Plus it will heat up and fans will be going bbrrrrrrr. May be worth getting a portable power bank if you can’t charge on transit. Also the largest SD card you can get to add to that puppy. Enjoy!