Where should I place custom command files in Git Bash

[sekedus]

Where should I place a command file in Git Bash?

For example, if I have make.exe file, should I put it in /bin, /mingw64/bin, or /usr/bin?

[dscho]

should I put it in /bin, /mingw64/bin, or /usr/bin?

None of those: They are owned by the Git for Windows installation.

Git Bash does prepend $HOME/bin to the PATH, that would be the appropriate place.

[sekedus]

Git Bash does prepend $HOME/bin to the PATH, that would be the appropriate place.

Is $HOME/bin the same as ~/bin?

[rimrul]

Yes.