maybe in specific things that the job will require.
yes, because different employers might have different ways of doing the work.
i don't believe i will have to retrain, but i do think i'll have to learn more things during my work life.
yes, each job has its own individual working arrangements, so you need to adapt.
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yes, depending on whether you switch jobs or if policies are updated and you need new qualifications - if i understand this question correctly.
no, if you are doing the job every day for the rest of your life, you should remember it.
if i work in the film industry, i feel that retraining might be relevant if i need to take on different tasks in which i haven't had much experience, but that would still require the skills i have acquired.