How much research should I do about a job role before taking the job offer? What should I research?

Not Reaserch nut Info is required like :-

Company's background

Their high and low stages

Start taking feedback from the market

Career growth 

And most imp the hire and fire factor,as stability is all we all look today

The most important thing is to research:

1- The company itself and their turnover rate ( the rate of people leaving the company)

2- Your job responsibilities. Make sure that they are clear to you.

3- Research the company's salary ranges.

Hi   l

Thank you for inviting me to answer this question

I have always believed in the 4Ps before accepting a new job offer.

1st P = Company Profile

2nd P =  Job Profile

3rd P = Package offered

4th P = Place / Location

After checking all of these you get an idea whether to go ahead or not.

Thanks & Regards

Betsy George 

Thanks for the invite..

I agree with Najat Al Baw

in stage of offer letter that meaning you accept the role or thinking for better opportunity

doing more research it depends on Job Profile as well your duties and what company expected from you

taking consideration of growth of your career.

so the search as below

employee turnover in the same role 

Company turnover

Salary Range

company profile in market

there is 3 ways to research about your job

1. look for the environment around you

2. be friendly with your co-worker

3. help each other when you and co-worker facing a problem

Before apply must know that, Do u ve such specialization and experience that is undergone in that organization.