Writing function notation might seem difficult at first, but it can be easy if you follow a few simple steps. Here’s how I break it down:

1. Understand the Basics: Function notation is about how an input connects to an output. You usually write a function as $f(x)$. Here, $f$ is the name of the function, and $x$ is the input. For example, if your function doubles a number, you would write it like this: $f(x) = 2x$.

2. Read Carefully: When you see function notation, take a moment to understand it. For example, if you have $f(g(2))$, it means you first need to find out what $g(2)$ is. Then, you use that result in $f$. Think of it like a mini adventure through the functions!

3. Evaluate Functions: To evaluate a function for a certain input, just change the variable to that number. For instance, if $f(x) = x^2 + 3$ and you want to find $f(4)$, you replace $x$ with $4$:
   $f(4) = 4^2 + 3 = 16 + 3 = 19$.

4. Practice: The best way to get better at function notation is to practice! Try different functions and see how they work. You can challenge yourself with more complex expressions like $h(f(x) + g(y))$ to understand how everything fits together.

By following these steps, writing and reading function notation will become much easier. Just keep in mind that practice makes perfect!