See here for other ideas...
https://www.techquity.co.nz/junior-courses/year-10-digital/10-6-introduction-to-3d-modeling
https://www.techquity.co.nz/l1-programmes-of-learning/3d-modelling
Now it's time to tackle your first modelling projects. We'll still follow YouTube tutorials at this stage as you still have lots to learn! However, feel free to tweak and customise as you go...
Once these basic ones are complete, there are many others to try.