Generally I like to maintain binaries. It could be downloaded or custom etc.
Here is what I do
mkdir ~/my_bin echo "export PATH=\$PATH:~/my_bin" >> ~/.bashrc source ~/.bashrc
Note: It last till the terminal session when you execute "export PATH=$PATH:</path/to/file>" at the command line.
To tell terminal to remember it everytime you start, add the same lines in the file ~/.bashrc or ~/.zshrc