Hello I have done more than a couple of wella technical workshops over the years, I was employed in a few wella salons so I suppose my boss paid at the time. It was practically learning about the level of lift by your chosen peroxide strength and the effect of your chosen deposited colour, base to reflect ratios or warmth counteraction etc. Using and understanding the colour wheel. Using mix tones to neutralize or boost colours. Etc. This type of education will improve your colouring skills dramatically and give you a deeper understanding of what is achievable.