If had I had known, then what I know now I would have never arranged for taxis/Ubers in Paris.
Although it can be challenging at first Paris has a very reliable and convenient public transportation system. Now I've never actually been to New York City but I imagine it has a similar atmosphere.
Quick note: if you do end up going to Paris make sure you don't get your hotels and airports mixed up. I flew into Charles De Gaulle and booked my hotel stay at Novotel Paris Orly Rungis which was an hour away from Charles De Gaulle and only 5 minutes away from Orly Airport (*face palm*). I ended up spending $105 USD on a taxi! It was at that moment I realized that I'm about to be on the Train!
Below is a map of the Metro stations in Paris which is downloadable here:
But...if you're anything like me this makes absolutely no sense. I don't claim to be an expert after only spending nearly a week in Paris, but I will do my best help.
Also known as RER, which stands for Réseau Express Régional, I frequently utilize three major train lines. I find most of the trains to be clean and enjoyable. It's fascinating to witness the diverse array of people during the journey, making people-watching an entertaining activity. However, it's worth noting that many individuals rely on the train as their main mode of transportation and can be in a hurry. Consequently, be cautious of potential instances of cutting or jumping in front of you.
Here's a brief summary and guide to the major train routes to reach common attractions such as the Eiffel Tower and the Louvre Museum.