Knifeplanet asked me to provide ONE tip for beginner sharpeners and you will see mine in the list below (New Edge Sharpening)
However.....there is a ton of fantastic tips here, each one is important and if followed will enhance your sharpening prowess. Even if you know how to sharpen, I think you will learn something from the folks here. I sure did, it brought back a lot of memories as I was learning.
Professional Knife Sharpening Tips
I hope you enjoy them.
left to right:
Kudos to Knifeplanet for finding these sharpeners and asking the question.