Abide by the rules, means you have to follow the rules, obey them, play by the rules. People from all walks of life - means there are people from all different kinds of background,social standing, or professions there. It's not just one type of people.

Abide by the rules means to follow the rules. In the UK we have to wear a seatbelt when we are driving or a passenger in the car. Most people in the UK abide by the rules and wear a seat belt when they are driving or a passenger in a car. People from all walks of life means many different people - different ages, sexes, nationalities, religions, class wealth etc. London is a very metropolitan city with people from all walks of life visiting it regularly. Hope this helps Jane :)

"Abide by the rules" is similar to "obey the law." "The rules" means informal, unofficial rules. "Abide by the rules" means they are asking you to please follow the rules. My barbershop chapter included people from all walks of life. Members included a dentist, a truck driver, a software engineer, a funeral director, and a forestry consultant.