correct way of storing external programm and making it executable?

I downloaded the CLI Client habash for the habit/routine gameification project habatica.com . In the fandom wiki for habash it is written that, I need to set environment variables. Additonally I want to make the program habash an ordinary CLI-program, so that I dont have to invoke it via the fullpath. I describe now, what I have been doing. I did the following. - After declare -x HABITICA_UUID=[myUserID] I did not find any entries in ~/.bashrc. Any one knows why? - Therfore I added HABITICA_UUID and HABITICA_TOKEN at the top of ~/.bashrc (and made a comment for myself) - chmod 600 ~/.bashrc because UUID and TOKEN are regarded as PWs. - sudo mv ./habash /opt - sudo ln -s /opt/habash/habash /usr/local/bin Is this the best way how to do it? (storing in /opt and linkint to /usr/local/bin ; variables in .bashrc and chmoding it with 600)