Causal loop diagrams map the causal relationships between pairs of elements within a system and identify feedback loops. These loops can either be reinforcing (vicious cycle) or balancing (goal-seeking) and complex interactions between loops can lead to unintended consequences.
Causal loop diagrams are good for exploring a qualitative understanding of a system. Helping you understand the system and its dynamics.
You might take a CLD and build a stock and flow diagram from it to begin to get a quantitative understanding.