First, download and install the appropriate version of Julia accroding to your OS and hardware by following the link: https://julialang.org/downloads/. On macOS I recommend downloading the .dmg file, and then following the installation instructions as you would any other application. Then one can either launch the application to begin using Julia (not recommended), or create an alias to the julia binary in the application bundle such that Julia can be launched from the command line. Assuming zsh is the shell of choice (default on modern macOS versions), run:

echo "julia="/Applications/Julia-1.8.app/Contents/Resources/julia/bin/julia"" >> ~/.zshrc

This command simply adds the line julia="/Applications/Julia-1.8.app/Contents/Resources/julia/bin/julia" to your .zshrc file, thus creating the alias. Alternatively, one can add this line manually to the .zshrc file in a location of your choice. If using a different shell, then this line must be added to the appropriate config file for that shell. For exmaple, if using plain old bash, one would add the line to the "~/.bashrc" file. If you don't know what shell you are using, then I suggest you google how to find this out.

Now run julia by running the julia command. You should see something like this:

$ julia
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.8.4 (2022-12-23)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> 

First, lets install some packages into your global julia enviroment. In the julia REPL, type ] to open the package manager interface. You should see something like:

(@v1.8) pkg>

The (@v1.8) denotes the current enviroment, in this case the global enviroment associated to Julia v1.8. Any project can access the packages installed in this enviroment, regardless of the packages installed in the projects own enviroment. This is useful but can cause problems with conflicting packages, therefore it is extremely important not to pollute the global enviroment with random packages for specific tasks you may want to do at random points. Save the global enviroment for a short list of essential and broadly applicable packages. For now, the only package we are going to add is the Revise.jl package:

(@v1.8) pkg> add Revise

If you accidentally install a package into your global env (it happens) then it can be removed by using pkg> remove PackageName. Keep your global environment clean! Now exit julia.

Navigate to your user home directory using Finder, or running cd ~ from the command line. There should be a hidden directory .julia here. To list files and directories from the command line, type ls -a where the flag -a ensures hidden files and directories are listed. If using Finder, then google how to display hidden files. Within the .julia navigate to the environments sub-directory and create a directory called nvim-lspconfig using the mkdir command or within Finder. Navigate into this directory.