But correct me if I am wrong, but in my country skilled labor means you have to have a relevant formal education to qualify for the job, (in addition to getting training on the job which is inevitable).
Yes, all jobs take skill. Unskilled jobs usually mean jobs that require no prior training or experience. They will train you and you will get experience there.
They're jobs for, currently, unskilled workers. Or at least, workers that do not have a skill they can transfer over to the workforce.
Requiring skill doesn't make it "skilled labour", though. The phrase means more than "labour that requires something that meets the definition of skill".
Not exactly, but close. Skilled labor is worth that unskilled labor such is required to replicate it. You don't need primary school education to be strong as fuck and great at busting rocks, such labor is far more productive per hour than the average.