key takeaways: 1） to understand how lightning works you need to understand bitcoin first 2） lightning is orders of magnitude more complex 3） for a transaction to happen both nodes that are transacting need to be online 4） overall it looks very promising as it eliminates the transaction and block limits bitcoin has 5） it can also theoretically improve privacy。 Not sure that running a lightning node with the expectation of a profit is realistic。 Also， running a node is not a set it and forget it t key takeaways: 1） to understand how lightning works you need to understand bitcoin first 2） lightning is orders of magnitude more complex 3） for a transaction to happen both nodes that are transacting need to be online 4） overall it looks very promising as it eliminates the transaction and block limits bitcoin has 5） it can also theoretically improve privacy。 Not sure that running a lightning node with the expectation of a profit is realistic。 Also， running a node is not a set it and forget it type of situation （like it is for non-mining bitcoin nodes）。 。。。more