When I started getting into Blender, like most people who start off learning from YouTube. And a popular example I can think off my head is someone who goes by the alias BlenderGuru.
He is well known on the internet for making Doughnuts on Blender to help people do complex modelling step by step. So I decided to follow the tutorial in a playlist on YouTube to improve on my skills as a 3D Artist, modeller. The reason I wanted to try this was because I had a thought that it would help me get greater skills in art.
After I was willing to complete the tutorial playlist, I was wanting to add more to the final render to showcase the finished result. So I decided to model an empty room with a window, a table with a plate and empty mug on it. The reason I did these additions to just the doughnut is just so it would seem less empty when I showcase.