You can never have more then 2 professions at one time. 1 primary profession, and 1 secondary. You can't be say an elementalist primary with monk and mesmer secondaries. You can unlock all of the secondaries so you can one minute be an ele/monk and then go in town and switch to an ele/mesmer for other skills.
Being a "jack of all trades" means being able to do multiple tasks.
Example, rangers can interrupt, mass degen with apply poison, use a bow attack skill for damage, and use an evasion stance to sort of "tank".
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