I did also want to say that it helped me a lot to buy a couple of recommended books on knife sharpening principles. It also helps diagnose what is going wrong with knife sharpening too.

This one by a professional knife sharpener

https://www.amazon.com/Razor-Edge-Book-Sharpening/dp/096660590X

and this one helped me.

https://www.ebay.com.au/itm/284852097625...95626d61664baf9