Placing purchase offers

[Nader Hachem]

Hey BP,

One of the things i came across while reading Brandon Turners- the book on rental property investing- says “analyze 60 houses a month, make offers on 6, have 1 agreed upon”. Not sure how this process works. If I was to make offers on 6 and somehow all 6 get accepted, am I obliged to purchase all 6? Are offers legal binding contracts to purchasing the property if accepted by seller? Or is there an option to back out?

Thanks!