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Mongo db collections

I’m new in mongodb world, i need to create a structure where a person has a job so person is the db and job is one of it’s collection, inside this collection i need to store for example “it developer” but this it developer has different fields, like ‘web designer’, ‘game designer’ etc… so how can i use mongo db for create this structure?
for now i’ve just created the collection ‘jobs’ but i don’t know how to proceed

I think you should take some courses https://university.mongodb.com/.