You can test it out if it's installed by opening your terminal / Windows Terminal / Command prompt and typing in node -v .
If you are on Linux or macOS there is a good chance you already have git installed. You can test it out if it's installed by opening your terminal / Windows Terminal / Command prompt and typing in git .
There are bunch of different IDE (Integrated development environment) or Text Editors you can you use to write code. You will need at least one IDE or Text Editors to be able to code. Personally we (@David Abram & @Danica Pivalica Abram ) are using VSCode. You can always try them, customize them and uninstall them if you are not satisfied.
I will use Google Chrome for debugging JavaScript. Google Chrome offers great developer tools.
You can easily create an GitHub account.