Know how the visa exempt rule works for UK citizens travelling to the USA?

could you please come back and rephrase your question ? i am trying to understand you ?

You are referring to the US Visa Waiver Program. There are currently 27 countries participating in the program, including the UK. The program allows eligible citizens to travel to the US for tourism and/or business for up to 90 days - no attending school, no working, no extensions and no changes of status.

UK citizens do not need a visa to enter the United States, just a valid passport.

you`re a f-u-c-k-ing knob....you know nothing about nothing you sad muppet