With these "first steps" you already get a very useful calculator that is easy to use, has interesting features, and has 18 digits integer numbers and 15 digits floating point numbers.
These first steps may actually be all you need. If you need more, Hypatia has a lot more to offer, as the following chapters will show.
Simple Calculations: Basic Operators, A Few Examples, A Few Error Examples.
Chain Calculations, $ and $$: Chain Calculations, The Previous Result $, The Penultimate Result $$.
Copy to Clipboard: Copy Result to Clipboard, Copy All Results One by One, Copy the Input Line
Next Chapter: Operators and Constants