1st October 2017 saw one of the biggest updates ever to the MCC Laws of Cricket. Additional updates, pertinent to the 2019 season, were published on 1 April 2019.
There are a variety of resources available from the MCC itself and from Middlesex ACO which can help you learn more about recent updates, or about the Laws of Cricket in general.
If you’re looking for competition regulations, you can find these here.