Routes of walks around Moscow can be a huge amount, because the city is huge and very interesting. If we assume that the excursion should introduce the classical sights to the guest of the capital, then you can go on the following route:

You can start it from the Garden Ring, along which the ring trolleybus runs. Walk along the New Arbat to Vozdvizhenka, from where you can reach Red Square through Manege Square and Alexander Garden. Take a walk there, take a picture at the zero meridian and in the Resurrection Gate of China Town, admire the Cathedral of St. Basil the Blessed, the Cathedral of Our Lady of Kazan, etc. Inspect the Kremlin, maybe even go on a tour of its territory and the Chambers or the Historical Museum.

Then walk down the Vasilievsky Descent to the Kremlin embankment (from here its walls and towers look even more impressive) and walk along it and Prechistenskaya embankment to the nearby Cathedral of Christ the Savior. If you are not tired of the abundance of impressions, then from the temple along the Boulevard Ring you can get to Arbat, where you can walk, if you want, looking at street artists and buying souvenirs.