Fusion 360, also from Autodesk, is a great step for students who have outgrown programs like Tinkercad. Where Tinkercad is like drag-and-drop, Fusion 360 allows you to model serious components and even whole machines, showing how the parts work together. This is a great program when designing components for things like robots or advanced maker space projects.
Like Tinkercad, it’s free to use for students, educators and hobbyists. Unlike Tinkercad, this is a much more serious software product that you’ll need to install on your computer.