Education vs Skilled Worker

[Wolfgang65]

Forgive me if I am repeating a question already asked and answered; I've searched the board thoroughly.
I have a Technician's diploma (2 yrs) in Mechanical Engineering; 14 yrs total full-time academic study.
That's under the heading 'Education'.
Then 38 occupations are listed in which one must have been skilled in working for over one year.
1.Would any occupation do or only one covered by my diploma?
2.How would one define "skill"?
3.How can I recognize an occupation that clearly falls under my education?
4.Regarding relative residents/citizens in Canada: full brother of my mother, does that count?
Thanks in advance