Sometimes we over-complicate things in our teachings. By trying to teach it all, we actually teach nothing.
Break things down to the fundamentals, make sure they are truly understood and then, and only then, should you move on to more advanced things.
If a person doesn’t know how to do simple math (adding, subtracting, multiplying and dividing) teaching them advanced algebra wont work.
Start with the basics, be patient, go slow and in the long run, much more will be learned
Have a great day!