There are a few ways to get to Monaco, depending on your location and the mode of transportation you prefer.
By air: The nearest airport to Monaco is Nice Côte d'Azur Airport (NCE), which is located about 15 km (9 miles) west of Monaco. From the airport, you can take a bus, train, taxi, or rent a car to get to Monaco. Some major airlines fly to Nice Cote d'Azur Airport from many destinations around the world.
By train: Monaco has its own train station, Gare de Monaco, which is located in the center of the city. The train station is served by the French national rail system, SNCF, and by the local Monaco-Monte Carlo train. Regular trains run from Nice-Ville train station to Monaco's train station, from where you can take a short walk to the city center.
By car: Monaco is easily accessible by car via the A8 motorway (also known as the "Autoroute Azur"), which runs along the French Riviera. You can also take the scenic coastal roads, such as the "Corniche" that connect Nice and Monaco.
By bus: Monaco is also served by a regular bus service, connecting Monaco to the nearby towns and villages, including Nice.
It is recommended to check the travel restrictions and necessary documents for entering the country, and also the parking and transportation rules in Monaco, as they could be different than the ones you are used to.