Every strategy has a moment where numbers become a decision. RSI is a number; "RSI is under 30" is a decision. These seven nodes are where that happens, and where several decisions get combined into the one signal an Entry needs.
Start with the Comparison, which makes a condition out of two numbers. Logic and NOT combine and flip conditions. Math and Constant build the numbers the comparisons read, like an ATR-based stop distance or a threshold you plan to optimize. Tally and Conditional Value are the two people discover later and then use everywhere: Tally scores "at least three of these five", and Conditional Value picks a number depending on which condition is true.
Comparison
True when one number is above, below or equal to another.
Logic
AND or OR over two to five conditions.
NOT
Flips a condition from true to false and back.
Math
Add, subtract, multiply, divide, max, min, average or absolute value.
Constant
A fixed number, and the usual thing to sweep in Optimize.
Tally
Counts how many conditions are true, or scores them by weight.
Conditional Value
Chooses a number by condition: if this is true, use that value.