Serious question for traders

For you guys who use technicals, do you understand the maths behind the tools I.e. MACD or you just know how to use the tool and roughly what it means?

When I was learning to use indicators and what it was and did, I knew how it was calculated. But that was a while ago and I forgot everything because it’s all bs anyway.

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Yeah I understand the tool and what it signifies that’s easy. The maths I know how to do but struggle to get my head around. I.e. Macd is a long Vs short average Vs an average of itself, when I think about it my head hurts.

I guess knowing how to use the tool is more important than the maths. Does a carpenter need to know how a drill is made, no, as long as he can use the drill.