Good guides for understanding smart contracts?

Can someone point me towards a newb-friendly / non-technical resource for helping me interpret smart contract transactions?

As an example, I would like to understand how exactly to know what is going on just by looking at transactions like this:

https://etherscan.io/tx/0x8e2f3f27e616d8be2d2d3095a996cf4c0af8c9c757c7ff034d352c11cc082394

Thank you