The terminal
The easiest way you can start feeling and thinking like a programmer is to use the terminal.
It may be intimidating but you will know how to use your computer directly and more efficiently. Even if you don't plan on becoming a full-time programmer, knowing how to use your terminal will elevate you to the rank of power-user.
Here below are short tutorials based on your operating system to get you started (recommended), you can also check out the light bash introduction I made (optional).
Getting to know your terminal
If you want your terminal to look great, below are tutorials to get you there.
Beware, to have your terminal look as you wish, it is less straightforward and might require a bit more time than you are willing to take, solely for aesthetics.