>>11402706>Where do I start with computer simulations?>modelling natural phenomena?What knowledge/skill base do you start with?
If you're very new to programming, modeling, and simulations then I can recommend pic related. It's a super easy start.
You can download the NetLogo environment for free and play around with models from their library. A lot of them are focused on social and complex systems but there are examples from biology, physics, chemistry, etc. as well.
