As of 1 Jan 2019 the USGA and the R&A have announced new rules of golf. Here is an excellent link to a slideshow showing the most significant changes to the rules. All players need to be familiar with these rule changes for the start of the 2019 golfing year.

https://www.golfdigest.com/gallery/a-comprehensive-guide-to-the-new-rules-of-golf

Full golf rules can be read here : https://www.randa.org/en/rog/2019/pages/the-rules-of-golf