If you plan to use python (which you probably are) you will want to install pip to help with package managing. Most python packages can be installed with pip.
sudo apt-get install python3-pip
Install RPi library for controlling the GPIO pins on your pi. Its a great library for getting started and a ton of tutorials reference it.
pip3 install RPi.GPIO
I also like to spice my terminal up to something with some color. This package (Oh My ZSH) is great open source update to the default terminal.
You can install it with the following commands.
sudo apt-get install zsh git wget <https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh> -O - | zsh chsh -s `which zsh`
|✔||Preparing the SD Card||4:02|
|✔||Booting Up & Configuring Raspbian||4:48|
|✔||SSH and SSH Keys||(Video Coming Soon)|
|✔||Install Redis on Raspberry Pi from Compiled Source||(Video Coming Soon)|
|5||Updating Python on Raspbian & Installing Useful Packages||(Video Coming Soon)|