Paris has an extensive underground system known as the Metro, which makes getting around the city hassle-free. However, you can also get around the town on foot or by taking a taxis/Uber. A Metro ticket costs around €2. Also, traveling to Versailles requires train travel, around €7 in one direction, and takes about 45 minutes.
If you have more time, you can explore other attractions in Paris such as the Sacre Coeur, the Orsay Museum, the Pont Neuf bridge, and the Notre-Dame Towers. For those with less time, Culinary-wise, the city is known for its coffee, croissants, and cheese, so be sure to try them out as much as possible.