1. **State the problem:** We are given the function $f(x) = 2x - 3$ and asked to find $f(0)$. 2. **Recall the function evaluation rule:** To find $f(a)$ for some value $a$, substitute $x = a$ into the function expression. 3. **Substitute $x = 0$ into the function:** $$f(0) = 2(0) - 3$$ 4. **Simplify the expression:** $$f(0) = 0 - 3 = -3$$ 5. **Conclusion:** The value of the function at $x=0$ is $-3$. Therefore, $f(0) = -3$.