You can find all of the notebooks here: https://github.com/JuliaAcademy/Introduction-to-Julia which have been updated to work with Julia 1.6

If you have not already setup Julia and Jupyter notebooks on your computer, please head to: https://juliaacademy.com/p/getting-started-with-juliaacademy

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.