Install Julia and nteract
Note that the notebooks in this course were created using Julia 1.0 so the default Runtime might be Julia 1.0 when you open the notebook.
After you open the notebook in nteract from any given section, just click "Runtime" -> "Julia 1.4.1" to switch your runtime from Julia 1.0 to 1.4.1.
You can find all of the notebooks here: https://github.com/JuliaAcademy/JuliaTutorials/tree/master/introductory-tutorials/intro-to-julia or download them individually in each section.
Have questions as you go through the course? The best place to ask is here: https://discourse.julialang.org/c/usage/first-steps/8 please include a link back to the lecture you are referring to so folks know what materials you are referencing.