Save the .bib file anywhere for now. You will want to move it into the LaTeX folder that you will create later. If you are curious about the contents of the .bib file, you can open it with any code editor such as Atom or Sublime Text. Plain text editors will work to an extent, but the formatting can be rather wonky with these.

Texmaker Set-up

Texmaker is the LaTeX editor. It comes with enough point and click supports to help the novice user, and enough functionality to satisfy the advanced user. If you are working on Windows or macOS, you may be prompted to install certain functionality during set-up or initial use. If you are installing on Linux OS, you should first install the TeX Live dependency. For Debian based distributions, that can be done with the following command.
sudo apt install texlive-full