Get the job offer in writing
In my previous life in staffing I heard some horror stories about people being offered a job, accepting it and giving their two week notice to their current employer only to have the new employer change their mind and rescind the job offer.
Most companies are ethical and when an offer of employment is made it is solid. Other companies might rescind an offer but give the person a severance package. No matter what the position or company, get the offer of employment in writing, and give written acceptance of the offer.
It’s just common sense to want to get an offer in writing. It will confirm your title, salary, start date, and possibly benefits like vacation time. Many companies put a spot on the offer letter for you to sign to indicate acceptance. If they don’t, here is an example of wording you could use in a letter or email:
I am pleased to accept your offer of employment and look forward to starting with (company) on (date). I look forward to a long and productive tenure with this company.
Getting the offer in writing is not 100% guaranteed that the company won’t be sleazy and take back the offer. It will give you piece of mind, however, as most reputable and ethical companies won’t go back on their written word.