It depends on what to take as a starting point. If we count from the Sun, then the Earth moves around it in an ellipsoidal orbit. If we count from another star, then all the planets of the solar system move in a spiral. And the solar system moves in a spiral relative to the movement of other galaxies.
No. The solar system rotates (with great accuracy) around the center of the Milky Way in a circle with a radius of 8,000 parsecs at a speed of about 250 km / sec.
p.s. How can you watch videos of this quality?