Define a Three.js scene, which serves as the container for all 3D objects.

Create a perspective camera, which acts as the viewer's eyes in the 3D world. Configure its field of view and aspect ratio.

Create 3D objects like cubes, spheres, or custom models using geometries and materials. Combine them into meshes and add them to the scene.

Adjust the position, rotation, and scale of objects within the scene.

Implement animations by continuously updating the scene and objects' properties, such as rotation or position. The above steps outline a simplified explanation of how to utilize Three.js's robust library, and give you a foundation to begin exploring the library's potential.