I wanna create courses, But I am no good at replicating them how are they done in unity?, Like there must be a way to get like a 3d map where we can lay down the detail and stuff all in unity.
That's what DropZone is saying. No Lidar for Canadian courses. Terrain data comes in many forms. Most accurate for our needs is Lidar point clouds that get converted to a heightmap. Usually resolution is best at 0.5m or less for the Lidar point spacing.
This can then be aligned with a satellite overlay to create the course in Unity with Course Forge creating the meshes, holes and hazards for the JNPG.
It all sounds like it'll take a day or two. Then, you fall down the rabbit hole only to emerge with a course several months later if you actually make it that far.
It's actually a fun hobby and can be as time consuming as you desire.