can someone tell me what this Numeric values steps are.
When i say Numeric values steps +- 10 Steps.. than i have a stop loss of 50 than he checked if there is a better strategy with a sl between 40 and 60?
The numeric value steps range help you to define how much do you want your search to deviate from the original.
+/- 10 means = search between 40 to 60 (from the original 50 parameter value).
If you only want to fine tune your strategies, then a smaller range would be better without destroying the structure of your original Strategy (what is considered as small range? it depends on your time frame. For a D1 time frame, +/- 10 may consider big but for M1 time frame, +/- 10 is considered a small range.
However for SL, TP etc, you can use whatever range you prefer (according to your risk management style) irregardless of time frame.