medical had a stroke
You should answer the question honestly and briefly. There is no reason to go into the details on a job application of your leaving a position.
improve my skills that is it
If you do not wish to answer honestly, then say something like "you wanted to develop your career and felt the change of job was necessary to your developmental experience".
for better prospectus
If a job application asks for a reason for leaving, it is best not to lie. However, a vague answer such as "personal reasons" can be acceptable.
The best way I have found to divert that scenario is the general, " To better myself and opportunities." The reviewer knows why you left....
Looking for a shorter commute.
i would not put anything due to the fact is a application i am filling out and i have not got the job so there is no reason to discuss my health
joining here is imminent