Moscow's metro system is not only one of the prettiest, but also one of the most efficient in the world. Trains are coming approximately every 1,5-2 minutes and bring you to your destination fast. It is quite clean compared to some other major city metro's and the routes are easy to understand. Especially with the app: "Yandex Metro" you can check the fastest routes and the estimated travel time. Buy a Troyka card and deposit money on it at the cash desk or at the machines. A one way trip is only 42 roubles, no matter how much you transfer or how far you go.
Nowadays most lines have both Russian and English announcements in the trains and in the city center also most signage on the stations is in English. But if you know the alphabet you should be just fine and only pay attention to the direction of the train once you chose the color of you "line".
The opening hours are from 5.20 a.m. to 1.00 a.m. In rush hours (8.00-9.00, 17.00-19.00) the metro is overcrowded, so it's better to avoid.
Taxi's are cheap in Moscow, but don't stop a random taxi on the street as they might be illegal and overcharging. We advice to use the "Gett taxi" or "Yandex taxi" app, because you can see the expected arrival times, route and rating of the drivers.