What are the important points to graph y=sin x-1?

A al sine graph $y = A \sin B x$ has amplitude $A$ and period $T = \frac{2 \pi}{B}$.
So in this case $A = 1$ and $T = 2 \pi$. This means that it takes $2 \pi$ radians to complete 1 full cycle.
However, the graph is now displaced 1 unit down so instead of $\left[- 1 , 1\right]$, the new range now becomes $\left[- 2 , 0\right]$.
The domain remain $\mathbb{R}$.