What was the specialist thing i did today?

I think the most hardest work i did today was the 3D stair shapes. That was a challenge. But Kenneth helped me and i finally finished the staircase. ( that was oblique ) The next one was called isometric i did not really know what it was about but it was still hard. The last one was the hardest it was a 3D square with holes in it i couldn't finish it because it was to hard.