The given function is $f(x) = -3x + 4$. To find $f(0)$, we substitute $x = 0$ into the function:

$f(0) = -3(0) + 4 = 0 + 4 = 4$

Thus, $f(0) = 4$.

Would you like any further explanation?

Here are some related questions you might consider:

1. What is $f(1)$ for the same function $f(x) = -3x + 4$?
2. How do you find the value of $f(x)$ for any given $x$?
3. Can you explain the slope of the linear function $f(x) = -3x + 4$?
4. How do you find the x-intercept of the function $f(x) = -3x + 4$?
5. How would you graph the function $f(x) = -3x + 4$?

Tip: Whenever you see a function $f(x)$, substituting values of $x$ directly into the function allows you to find the corresponding $f(x)$.