The highest is postdoctoral or a Ph.D degree. The second highest is masters degree. Both are called 'graduate' studies. The lowest level is The Bachelor's degree or your 'undergraduate degree' in college.
degree => masters => then doctoral =>professor
Typically you need a Bachelor's Degree to begin graduate work on a masters or doctoral (PhD).
If you are a doctoral candidate, you do not yet have a doctoral degree and so do not have credentials at that level. You may have a Bachelors or Masters degree that you can list if you want.
Yes, there are post-doctoral degrees that can be pursued after obtaining a doctorate, such as a post-doctoral fellowship or a higher doctorate.
No, post-grad includes honours, then masters then a phD.
In the USA only doctoral robes have stripes, and the color of the velvet tells you which doctoral degree it is. Bachelors and masters do not get stripes, but they get different sleeves.
A bachelor's degree is received after 4 years (or so) of college. If you continue with college you can receive a master's degree (I believe its about 30 extra credits). You can continue with coarses and receive your doctoral degree and I'm not positive, but I think its 60 or 90 extra credits. The doctoral degree is higher.
The doctoral gown is a more elaborate than the bachelors, and masters gowns. The facings and crossbars may be of velvet of the color distinctive to the field of study to which the degree pertains.
doctorate degree is after masters, and it takes around 8-12 years. Sometimes it may be 12 years min., and you have to get the degree to become a surgeon, cardiologist, blah blah blah, etc. etc. etc...... whatever.. but that's it.
"Tertiary degree" is just another way of saying "Doctoral Degree" It means the third degree, where Bachelor's is the first and Master's is the second. Tertiary is NOT ONLY doctoral degree. It is any degree after higher secondary school. This includes Bachelors and masters degree too.
In general, a masters degree will earn you a higher salary, regardless of what the degree is in. It is worth it to go back to get your masters. you will earn a higher paying job.
Any researcher who holds a bachelor or masters degree and working for an organization. In universities holds a doctoral degree.