"Scope" has a lot of meanings, so check a single-language English dictionary. My favorite is ahdictionary.com, the American Heritage dictionary. However, all the meanings are similar. It means the bounds, limits, area, or range within which something is free to move.
For example, suppose a business contract says that a contractor will add a new room to the house. They cut a door, building a frame, put up walls, and paint them. But they leave a huge pile of junk next to the house. You say "you didn't clean up and remove the junk." They might say "That isn't within the scope of the contract."
Suppose you are considering a job at a big company. At a little company, there might only be one boss, and no matter how good a job you do, you will never become the boss. At the big company, though, you might have a career path: Software Engineer 1, Software Engineer 2, Senior Software Engineer, Architect, Director, Vice President. The big company offers you a lot of "scope for advancement." You might or might not ever become a vice president, but the opportunity or possibility is there. The positions you could reach are within the "scope for advancement."
There is a technical nautical use. The only reason I'm mentioning it is because it helps illustrate the general meaning of the word. Boats are anchored by a long line. Because the line is long, the anchor stays in on place, but the boats can move around. If the wind and currents go one way, the boats will move that way. If they go the other way, the boats will move the other way. But because of the rope, there is a limit to their movement. The word "scope" can mean "the area over which they can move."