For basic light I suggest viewing this video

https://aximmetry.com/en/documentation2/video-tutorials/for-content-creators/getting-started-02-3d

For Controllable Lighting you can return to this video

https://aximmetry.com/en/documentation2/video-tutorials/a-complete-studio-scene/complete-studio-scene-08-controllable-lighting

Also I suggest to watch the official aximmetry video tutorials in this webpage

https://aximmetry.com/en/online-documentation

As Ahmed wrote. The information specifically about adding a spot light starts at: 9:50.