New Rules of golf 2019.See link below

The R&A - 20 Must Know 2019 Rules of Golf Changes

https://www.randa.org/RulesEquipment/Rules/20RulesMustKnows

Read our guide below or download the PDF version. Drop from knee height (NOT shoulder height) Measure the area to drop in with the longest club in your bag (except a putter) Drop in and play from the relief area.